Trying to turn off auto renew (6 emails and no replies).

I've been trying to cancel my Skydrive auto-renew so I can remove my old credit card from the system. I cannot remove that credit card because it's tied to a Skydrive subscription. I've emailed support 6 times and not a single reply or a call-back. I really hate that you don't even provide me the ability to manage my subscriptions, and force me to take this route. There is no option for me to manage my subscription as detail in the help - there's no button.