I've had a similar problem. I had an account with Audible.co.uk for years, and all went well until the bank I was using for my credit card was bought by a Swiss bank, and suddenly I could only get books in German.

Bizarre, but fine, so I changed to a US credit card, and all went well again for a while, until suddenly I could only get books in German again. Somehow my old credit card which I was NOT using was back in my profile.

Bizarre, but stuff happens. I'll just call Customer Services.

Word of advice. Never try to go through Audible's Customer Services. They keep no records of what you say, so the next time you call to complain they have no idea who you are. They have no Supervisors. They tell you they do, and one will call you back, but it's a lie. They tell you that "Don", the supposed CEO of Audible, really cares about the Customer Services "experience". Maybe he does, but in that case, he's a sadist.

Somehow, the Audible software has decided either that Chase Manhattan is a German bank, or that the card I am not using is my "real" card. Either way, it makes no difference. No one at Audible has any access to the software, so it can't be fixed.

Or maybe it's just that complaints to "Don" are just not audible.