If you submitted a request via AppHub, to either the "Device Unlock" or "Account Management" categories and never heard back then your request has most likely gotten stuck somewhere.

So What Do I Do?

The problem has been found and will be fixed by Friday - so resubmit your request any time after Friday and you should hear back from the team within approximately 24 hours.

Do I need to resubmit, or will my old, unanswered, requests suddenly be answered?

You will need to resubmit - existing, unanswered, requests (only in those two categories) will not be processed.

Good Luck!