What should I do if I have been charged a minimum penalty that I disagree with?

By asking staff at stations or any of the two customer service centres located at Pl. Catalunya station (8am to 8pm Monday to Friday except public holidays) and Pl. Espanya station (9am to 2pm and 4pm to 6.30pm Monday to Friday except public holidays) for the book of appeals against minimum penalties, where you will have to complete the corresponding form.
If you wish to send them by e-mail, the appeals require the signature on the original document of the person who has received the penalty. Accordingly, it is essential that you attach – scanned or in image format — a written document with your signature, National Identity Document, and the documentation indicated above.
These documents may be sent to us at the address atencioalclient@fgc.cat within a maximum of one month as of the date indicated on the penalty notice.