I just did a live chat with an AMEX rep as well. I passed the $30K spending threshold and I'm due 15,000 MQM's. He said he'd "open a ticket" on the tracker not updating. He also said that they've passed all of my spending info on to Delta and I need to contact Delta to find out when my MQM's will be credited. Sounds like he was just trying to close out the chat session.
Sounds frustrating... one of those cases where Delta tells you to contact AmEx, and AmEx tells you to contact Delta? "It's not our fault, it's theirs...."