Hyundai Finance....ugh

I am on a lease with a car, which I love.
Yesterday, I got a letter from them informing me of a toll violation in a neighboring state. That's fine even thought the "violation" images clearly show my transponder in the car. And for some reason my transponder didn't pick it up. Checked transponder and it was working before and after the incident, also in othe rneighboring states. Anyway, the bill was for $24 and I am told to pay with my next monthly payment. I log into my account and now the bill is $25.52. I called and was told, oh yeah that was our bill. Thing is the letter from the Toll Authority to Hyundai included their invoice of yup.. $24. The CSR did a crap job of trying to claim they got a second letter stating the charge was actually $25.52 and not $24. I asked if I could get a copy of that, and was refused. If they said it was additional to cover Hyundai, I'd have accepted it, but he dug in and claimed it was an additional fee from the toll people.

TLDR: Hyundai finance tacking on bogus fees of 6.33%