Write for the reader, not the reviewer
The reviewer has already made up their mind. The audience is the hundreds of prospects who will read that exchange while deciding whether to call you. That reframing changes everything about how you write: you are not winning an argument, you are demonstrating what it is like to deal with your company when something goes wrong. Buyers routinely say that a calm, specific reply under a bad review is what persuaded them, and that a business with no negatives at all looks filtered.
