[avidiax]

I feel like we need a "Jeff Foxworthy" rule for determining anti-trust.

"If your counterparties are afraid to assert their rights, you might be a monopoly".

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For OP's case, I feel that someone changed his payment details, and now this dept. at Amazon is covering up and hoping that OP will go away.

[gruez]

Does Amazon really have a monopoly on custom printed tshirts? I didn't even know they offered such a service, and can think of plenty of other alternatives.

[jeffwask]

No, but they have a massive one in the online sales space and there are plenty of articles talking about if you cared to look.