I'm sorry but what type of company would need you to phone them up just to cancel my credit card details off of my account, any company should have the option to directly remove their card details & have the option to choose whether to auto re-new subscription, especially as this is Microsoft, I would of thought they would have a decent payment plan.
Also giving you a removal button to delete the details, that doesn't actually work is a bit mis-leading, I don't want to have to phone them to get rid of some personal information, which by rights I can & should be able to delete at anytime.
Seriously, this is stupid.