For example, I bought 6000 copies of 1 set, and later I want to return them, obviously I won't return them!
I said, then I'll change the 5000 model! He said yes! But I can only refund you 800!
The other 200 is the handling fee (or wear and tear fee or other). In short, it is to tell you that he will earn more because of your substitution! If it can't be true, I will give you a refund 1000!
I have bought similar unsatisfactory goods, but I can't return them. I'll tell you directly, it's not easy for you. I'll give you 300 directly, and you can refund it for me. Later they returned so much. That's what they did. They just want more benefits!
Since I bought it, that's it!
If you feel uncomfortable, you'd rather lose some points and get back 18888!