I had rented the car in Vienna and did a day trip to Budapest. I had bought the Vignette at the Hegyeshalom Border Crossing (on the way from Vienna to Budapest). I have now email from my Rental Car Company about fine from Hungary Department for driving without Vignette. I don't have a proof document now, and it was paid by cash (as they didn't had pay by card option at that shop). How can I find out the phone number of the agency who sold me ticket? Any help in greatly appreciated.