From the looks of it, they are banning your alt Amazon accounts because one of them was found to be repeatedly trying to loan stolen Amazon Gift Cards onto them.
What exactly is the issue? If you were using stolen AGC on one account that caused them to close that account, don't you think they would close your other accounts as well? From the looks of it, they got it right considering that you got the email.
so anyone can give you stolen gift cards.
where's the evidence?
theres 4 differnet gift cards; they haven't explained anything if any one specific card had a problem with it.
I have cash paid receipts and they didn't say ANYTHING about them
You are right that anyone can give you stolen gift cards, and that is exactly why you would only purchase gift cards from reputable sources/people. As I have mentioned several times above, I am not sure what you expected when you were getting large discounts (larger then other cash methods) for these gift cards.
I am not sure what exactly the person who sold you the gift cards did, however it would be possible that they reported the AGC as being stolen, or they could have paid with cash, then immediately asked to return the gift cards and paid with a stolen credit card, or something similar.