When this happened to DH, we had to fax a copy of his driver's license to them to establish that we were two different people. We had been using one computer to do both mypoints accounts. Thankfully, we've been able to stop that....and use separate computers to do the different mypoints accounts.
As I remember i didn't even wait for them to tell me, but faxed the license and a note asking for reinstatement without them asking, after reading that on one of the message boards. His account was reinstated shortly thereafter.
Good luck! I hope you get reinstated soon.
Lisa