Hertz Rental Car Took money from my credit card 3 weeks after returning car for "toll" fees without invoice or bill Centennial Nationwide

We rented a car for over 2 months with Hertz because our car had a recall that they couldn't get parts for. We asked about using our toll transponder and were told that there is a transponder in the vehilce and we would get a bill. On drop off, we asked if we needed to pay for tolls and were once again told we would receive a bill. 3 weeks later, I notice almost $40 on my credit card for "Hertz toll charges". There is NO way we used $40 in toll fees. Hertz "customer service" isn't any help (because it's a different company... then WHY does it say Hertz). Asked for supervisor to return my call. No one ever called. Tried to call toll company and they were very rude and unhelpful. I'm told there are "admin fees" and "service fees". WOW! I asked how they could charge my credit card without sending me a bill or invoice. They said it's on the agreement they can charge your credit card for any fees (like anyone reads those, I go by what the rep. tells me). I have sent a message online, no response. HOW can a company just take money from someone's credit card and say "Oh, you owe it, believe us". I'm supposed to just take their word for it that I owe that. I should be able to agree to the charges before they are billed. And, admin. fees and service charges... for WHAT?