They implied they would screw me up to the maximum amount possible, beyond any cost of the actual repair

Car rental companies, not this one to be fair, are well known for finding hidden and unrecorded damage when you return too

But the company isn't called "Mafia" so I guess my comparison doesn't hold any water right?

Ye I was mainly pointing out that the mafia also cause the damage when you don't pay the "fee" in the classical use of the saying.