Midland's game is not really in the FBI's wheelhouse. We have two federal regulators with oversight of consumer debt collection, the CFPB and the FTC. They would welcome your input. You can also try the Attorney General of your state and MCM's home state of California.
It's nearly impossible that you would have incurred a genuine debt in your name. Midland is infamous for recklessly calling everyone and the neighbor's koi pond who they think might rattle the cage of some alleged debtor. You don't have to take that noise. Tell 'em to knock off; they must obey per state and Federal law. Even better if you send them a "shut up" letter with olde fashioned paper and USPS Certified Mail. See, junk debt collectors like to play stupid and pretend not to recall your verbal demands.
Prior discussion for "not me" cases is found here: http://800notes.com/forum/ta-34af6a034ba34b6/unending-collection-calls
Fair Debt Collection Practices Act - FTC
CFPB Q&A on the FDCPA
This is the third number that has called my house in past 30 days from Midland. About 14 total calls. First two numbers from AZ, now they which to MN. I tried to tell these foreigners that have working for them that I live Florida. It is forbidden by law for a debt collector, even if it is legit, to call anyone on their cell phone. They face a $1500 fine for each call, but they seem not to care. It is getting close to lawyer time, but I want to let them run it up.....maybe I can get a newer car....