> I sent it back and got a warning that if I return anything else in "non original condition" I'd be banned.

I have a similar story, they "delivered" when I was out, hidden behind a wall in my garden

when I found the package two days later, the expensive books had been ruined by the rain

I explained to their CS, they issued the return authorisation

then after they received the return they threatened me for not returning in "original condition"

I was a customer since the early 2000s, a prime member since it started, with something like 2 returns total in that time, with tens of thousands of spending (to this exact address)

I deleted my account