In the UK it would certainly be _annoyingly_ expensive, given I'm calling because I want to stop spending money on whatever. I'd expect a connection fee + ~£1/min + rate they charge an American caller, and you know you're going to be kept on hold for ages.

It's bad enough calling to complain/cancel a local company - I've paid several pounds a time; I certainly avoid it if at all possible, and would more so with an overseas company.