How do you reply to a bad review after you've already fixed the problem?

Short answer

Reply publicly noting the issue is resolved, thank them for flagging it, and politely mention they're welcome to update their review. Never demand they change it.

What to say

• Acknowledge the original problem and that you've addressed it.
• Thank them for surfacing it — it helped you improve.
• Invite, don't pressure: "If you feel we've made it right, we'd be grateful if you'd consider updating your review."

This shows future readers that complaints get resolved, which is reassuring even if the star rating never changes. Many customers do revise a review once they see a genuine fix — but the ask has to be gentle.