Listen

When your customer gives you the opportunity to make corrections, you shouldn't argue with them about how you're right or how it's someone else's fault.

Take the opportunity to have a dialog. Listen, collaborate and correct.

If your customer gives you the opportunity to make corrections it means they're unhappy, but still want to do business with you.

Of course, you don't have to make the requested corrections. If you choose not to and your customer fires you, there is no reason to be angry.