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.