$100 to correct my name on reservation

President Circle a reservation made on Air France website. The price for a month rental was 503 euros. Unfortunately, there was an error in input of my last name. Chatted with Hertz CS representative requesting to correct the mistake, no other modification was requested. His response to my name change was that the booking will now cost $689. He then proceeded to say that $689 is equal to €502. I have a calculator 🤣. I ended up cancelling the reservation and rebooking. I hate when a big Corporations cheat their best customers 😡.