[91S2]

I've had problems with getting my car towed after an accident by a company i wasn't fond of, also, After making a stink I came to find that towns, city's, etc; have contracts with tow companies and are forced to use them, unless you're not impeding the flow of traffic and your tow can respond as fast as theirs. From the pix, it's doesn't look like you were blocking traffic, though. I wasn't there, but I doubt the cop was on "the take." He probaly just didn't want to listen to the tow truck driver complain about not getting the job.... either way it's wrong.
good luck with everything