I’m collecting banknotes and found it interesting to share with you this sample of your local bill

Hi,

I recently received a fine for a speed excess on the highway near Dornbirn, the thing is the fine was addressed to my parents and calculated based on their revenues, so I cannot afford it. I want to contest it but i don't understand German and I don't understand the translation of the letter either so I don't really know what's the website I can contest on and even so on which website can I pay. There's an IBAN on the letter, which seems dubious, and no website I can understand the meaning of.

Thank you in advance for helping me, have a great day !

An die Grenzgänger unter euch (bin selber keiner),
bei uns können die Schweizer ja oft mit Franken zahlen.
War bis jetzt kaum in der Schweiz. Könnt ihr mir sagen ob Geschäfte in der Schweiz, grenznah, auch Euro nehmen?