Have I been confused by paying the fee, what do I have to do?

If you have made a payment for a lower amount to which you are entitled, you can make a supplementary payment via this link, select the corresponding fare, update and once located, tick “Payment of additional amounts” indicating the number of the proof of the first payment as well as the difference to be paid.

• If overpaid, you can request a refund, paying a new fee for the correct amount or waiving the difference. In this link there is the procedure to follow in case of return.