I had a record showing that I had tried to be reasonable, so if anyone reasonable was willing to talk to me, they could see that. But the reason I didn't just cancel the card and leave it at that is exactly that reason. After a month of them trying to bill me on a cancelled card, I called them and offered to pay the ETF PLUS the late fee if they would just let me email them proof that I had moved. It was still cheaper than flying back just to show them my drivers license.