I encountered similar issues when I renewed my subscription earlier this year. Instead of extending my existing subscription, they started a second one, which meant my receiving 2 issues and my subscription not extending as far out as it should have.
After several weeks with no reply to repeated inquiries, I reached out to Mark Reasoner, current ASDA president, via his personal email address, and that finally got results.
http://www.americanstampdealer.com/....aspx?ID=352