I have an existing WP dev center account. I signed up for this 'premium' Nokia membership and now have a token I can use to :-

I already have a membership in the Windows Phone Dev Center. Does this benefit help me?
Yes. You can use this benefit to extend your existing Windows Phone Dev Center membership by one year. So, for example, if your membership in Windows Phone Dev Center were to expire in January 2013, you could use this benefit to extend your expiration date to January 2014.

The trouble is there is no way to redeem this without going through MS helpdesk who are pretty useless, either not knowing what to do or passing it 'higher' with a 'we'll get back to you' promise that never happens.

Has anyone actually been able to use a token to extend and if so how?