Purely hypothetical question. Recently I rented a car from a company, let's call them Thrifty, the total cost for the trip was ~$150. Days later I got a bill for ~$70 in administrative charges for having them pay ~$7 in tolls. They will automatically collect this money from the card used to pay for the rest of the rental. I'm sure this was specified in the contract and is completely legal(something like a $15 per toll they had to pay).
In addition to never using their services again, I was wondering if there would be any serious repercussions to marking the transaction as fraudulent on the credit card and making them justify the transaction to the credit card company to get payment. Obviously this would be unlikely to get me my money back, but I like the idea of spitefully causing them to have to do more work, since I feel taken advantage of.
This is in the United States.
If I take this action, am I breaking any law? If I am, am I likely to be prosecuted for the breaking of said law? Am I likely to have my credit score decreased (perhaps not on topic)?