A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,417
Call DL and ask/complain. Is there a chance that the status associated with your ticket could be incorrect? Perhaps you moved from GM to PM after purchasing the ticket, although DL has been saying for a while that FF numbers don't need to be removed and re-entered in such cases.
Have you checked whether your flight currently has upgrades available? If so, a phone call should get you an upgrade.