You start by pasting or retelling one real complaint: what the customer wrote or said, what you answered first, how the conversation went from there, and how it ended. The tutor reads it as the customer would and shows you the exact message where the tone turned, or where the customer stopped replying.
Then it drills the step you missed. If you jumped straight to explaining, it makes you write back a reply that only shows you understood, with no defense in it. If you offered a fix without asking, it teaches the clarifying questions that tell you whether the customer wants a replacement, their money, or just to be heard. If you refunded by reflex, it walks through when a refund is the right call, when an exchange or store credit serves both sides better, and how to say so without sounding stingy. It compares this to a customer shouting at the counter: the whole shop goes quiet until someone listens, and only then does the room relax.
At the end, you rebuild the conversation as it should have gone, message by message, in your own words. The homework is to run the next real complaint that reaches you this way and to check back with that customer two or three days after the fix. When you return, the tutor asks what the customer said at each step, whether they bought again, and fixes only the step that fell apart.