Tyne Tunnel Fine

I have been fined three times from the Tyne tunnel for not paying for a passage (it was over 2 days, all the fines have arrived at once). I added my car onto my Tyne tunnel account but accidentally typed 2 of the letters the wrong way round in the registration (AO instead of OA). I have appealed to see if they would waive the fine and I can just pay for my passages but was wondering if anything similar has happened to anyone else before and what the outcome was?

I understand it’s completely my own fault, but it was an easy mistake which I have updated on my account now