Comment and complaint boxes: how to hear problems first, and fix them
An unhappy customer who tells you is a customer you can still keep.
This guide covers how to set up a comment or complaint box, and how to answer what comes in.
Updated 13 October 2026 · 8 steps · about 4 minutes
On this page
The short version
- Call it a comment box, and let people say what kind of message it is.
- Put it where the problem happens, and on receipts and your website.
- Answer within a working day: thank them, say what you will do, then do it.
- Look for the same problem twice, and show what you changed.
1. Why a complaint box is worth having
In short: A box lets unhappy people tell you, instead of everyone else.
Many unhappy customers never say so to your face.
They leave, or they tell other people instead.
- Easier than a conversation. Writing a few words is easier than complaining to a person at the counter.
- Private first. A message to you can be answered before it turns into a public review.
- Things you cannot see. Customers notice problems your team walks past every day.
2. Comment box or complaint box?
In short: Call it a comment box, and let people say what kind of message it is.
It is the same box with a different label.
The label changes who writes.
- Comment box. Invites anything: praise, ideas and problems. It feels welcoming, so more people use it.
- Complaint box. Says plainly that you want to hear about problems. It suits a service desk or a returns counter.
- One box for both. Let people say what kind of message it is: a suggestion, a problem or a compliment.
| Invites | Best for | |
|---|---|---|
| Comment box | Praise, ideas and problems | Most places |
| Complaint box | Problems | Service desks, returns and support |
| Suggestion box | Ideas | Staff, members and regular customers |
3. Where to put it
In short: Put it where the problem happens, and where people look for help.
Put it where the problem happens, while it is still fresh.
- At the counter or the exit. A QR code people can scan on the way out.
- On receipts and order emails. A link for anyone who notices a problem later, at home.
- On your website. On the contact and help pages, where people already look when something went wrong.
- In waiting areas. Waiting is when people have time, and something to say.
4. What to ask
In short: Ask one specific question, and let people add more if they want.
A specific question gets a specific complaint, which is easier to fix.
- To hear anything. "What could we do better?"
- After a visit. "How was your visit today?" as a quick rating, with room to say more.
- When something went wrong. "What went wrong, and what would have made it right?"
- To keep it short. Ask one question per box. A long form gets abandoned.
5. How to answer a complaint
In short: Thank them, say what you will do, then do it.
How you answer matters more than the problem itself.
- Thank them. Even when it is hard to read. They took the time to tell you.
- Say what you will do. Or, if you cannot change it, say why.
- Fix it, then say so. A second short note when it is done shows the first one was not just words.
- Keep it human. Write the way you would say it to their face. No template phrases.
- Never ask who they are. Do not argue, and do not try to find out who wrote it.
A suggestion box tool lets you answer people who left no name: they see your reply on their own message.
6. A reply you can adapt
In short: Thank, agree, say what happens next, invite them back.
Four short lines cover most complaints. Change the words to fit.
- Thank them. Thank you for telling us about this.
- Agree on what went wrong. You are right: that should not have happened.
- Say what happens next. We are changing how we do this, starting this week.
- Invite them back. We hope you give us another chance, and tell us how it goes.
7. Answer fast, and do not lose any
In short: Answer within a day, and make sure none get lost.
A complaint answered the same day feels very different from one answered next week.
- Set a time. Answer every complaint within one working day, even if the fix takes longer.
- Let people flag urgent ones. An option like "This needs attention today" puts serious problems first.
- Have a backup. If nobody answers in time, someone else should be told.
- Close each one. Mark a complaint done when it is fixed, so nothing is left open.
8. Look for the same problem twice
In short: Fix what keeps coming up, and tell people you did.
One complaint can be a bad day. The same complaint from several people is a problem to fix.
- Group by topic. Wait times, staff, product, price, cleanliness: sort what comes in.
- Review it monthly. Look at what came up most, and pick one thing to fix.
- Show what changed. A sign, a post or a line on your website: "You told us, we changed it."
Checklist
- Choose the label: comment box or complaint box.
- Let people say what kind of message it is.
- Put it where problems happen, and on receipts and your website.
- Ask one specific question.
- Answer every complaint within one working day.
- Make sure someone else is told when nobody answers.
- Mark each one done when it is fixed.
- Review the topics every month, and show what changed.
Start with a free suggestion box
Your own link, QR code and posters, and a way to reply to every message, even anonymous ones.
Reading and replying are free, always.
Common questions
What is the difference between a comment box and a complaint box?
Only the label. A comment box invites praise, ideas and problems; a complaint box asks for problems. Most places get more messages from a comment box that lets people say what kind of message it is.
Should a complaint box be anonymous?
Let people choose. Some will only write if no name is needed. Others want an answer, so make an email address optional rather than required.
How quickly should I answer a complaint?
Within one working day, even if the fix takes longer. Say what you will do and when.
How do I reply to an anonymous complaint?
With a paper box you cannot. With a suggestion box tool, the person sees your reply on their own message, without either of you knowing the other's details.
What should I do with complaints that are unfair?
Answer them politely anyway, and say what you can and cannot change. Other people may be thinking the same thing.
More guides: How to set up a suggestion box · Suggestion box ideas · Anonymous feedback forms · Online suggestion boxes · Employee suggestion box guidelines · Safety suggestion boxes
For your kind of business: Restaurants and cafés · Shops · Online stores · Hotels and rentals · Clinics and salons · Schools and colleges · Churches · Gyms and studios · Libraries · Factories and warehouses · Microsoft Teams and Slack · Events and workshops · Websites · Employees and staff