I filled a complaint with the FCC today , next step consumer affairs, then public utilities commission. HOPE THEY GET THE POINT.
TL/DR - File a complaint with your state's Attorney General. The FCC and your state's PUC can't help you.
The FCC and your state's PUC will take complaints about wireless services, but they have no authority (and thus no money and no staff) to investigate then negotiate or force a wireless carrier to remedy an individual customer complaint of this type. The FCC and state PUC's take these kinds of complaints, make a note of them, then file them away never to be touched again. They count them, that's it.
Filing a complaint with your state's Attorney General's Consumer Protection Division/Office of Consumer Affairs/Whatever they call it in your state is your best bet. They have the mandate, the funding and the staff to take the individual customer complaints, contact the carrier, require a response and negotiate a remedy. Wireless carriers have dedicated staffers who deal with AG's office staffers - they take the AG's office seriously.
If the carrier doesn't respond (which is unlikely) or doesn't follow thorough on a negotiated settlement (again, not likely) the AG has the data needed to build a legal case against a carrier that is regularly harming consumers. If you don't file a complaint, the AG will never know there is a problem.
I don't think TMO or any of the other parties involved are out to harm you, are acting fraudulently or are intentionally ignoring you. It's more likely that the stolen phone data system got set up, but the carriers and system administrator (I don't know who won the contract...Lockheed-Martin?) didn't work through obvious operational issues like what to do when an IMEI is added by accident and how to quickly remove IMEI's added by error. An AG's office complaint will ensure that someone on staff in the TMO executive office will do whatever it takes to work with whatever company administers the list and get your IMEI removed.
If this gets resolved quickly via normal TMO/MetroPCS customer service channels that will be great. However, that will also be pretty amazing in my opinion. Any system that involves a bunch of private companies, the government and a government contractor running a computer database is going to take months or years to get running smoothly. This system is brand new, so its probably goofed up. Eventually this kind of thing will be easily fixed, but for now I think its a good idea to drop the hammer and get the AG's office involved, otherwise some low level TMO customer service manager will be grinding away at this for a month and getting nowhere, despite their best efforts and sincere desire to help you.