I do remember I had to jump through a couple of hoops to get something (about $8000 worth of something) shipped to an address not on file with my credit card, which is not something Amazon has ever done (I'm always shipping to weird places because I travel mostly full-time in an RV), but it wasn't too traumatic.
I can't imagine why they'd ban someone permanently. I mean, they want money, right? That seems weird. But, also sucks.