Earlier quoted context omitted.
That's terrifying. Did they at least give you time to backup your data?
Please note that Hetzner does this only in couple cases: a) fake account data ; b) previous strikes (unpaid invoices, abuse etc..) with them ; c) in some cases customer is from country they do not do business with. I bet gazzilion OP above is within a or b
I'm awaiting donwvotes, but honestly, if they don't give you a reason, everything can be one, and refusing a service on arbitrary grounds seems illegal to me :D