Legal Advice Euro Parking Collection EPC

I (swiss resident) received a letter from Euro Parking Collection PLC for not Paying the Toll at Tymes Tunnel in the UK. After a bit of googling, I found out that the signage at the tunnel itself is not visible and one can pay the toll, without additional feesif one declares not being local to the area. Now the problem is that before I was aware of all of this, my toll and fine got forwarded to the Euro Parking Collection LLC (EPC). The letter got to me 30 days after I had not passed the toll. As soon as I found out there was an open invoice in my name, I found the information of only having to pay the toll, and even the letter I received from EPC stated that I can pay only the toll within 14 days of passing the toll. Since the letter arrived so late, I paid the toll and emailed them, explaining the situation.

My request got denied and now are expecting me to pay the full amount. The bill breaks down the following ways (letter is in German and I don’t know the translations, hence the German Terms):

• 69.55 CHF Unpaid toll fee
• 86.94 CHF administration fee
• 2.55 CHF Mautgebühr (original Toll Payment which I paid)
• 159.04 CHF total amount
• 2.55 CHF Paid/waived
• 156.49 CHF Open amount

Now I am aware that in Switzerland one only has to pay the original payment + “interest payable on late payments" (default interest).

The letter doesn’t tell me what the Verzugszins is and it can be a maximum of 15% of the original fee.

Does anyone have any experience with EPC? I’m glad for any help I can get. Thanks!