There's an appeal process. Read the small print and go to a specialist site like pepipoo for the current procedure. If it's how it used to be when I appealed a parking ticket on a red route, you end up putting your defence at a 1 to 1 meeting with an adjudicator. I don't know whether you lose your right to a discount if you appeal. (I got lucky. The other side didn't submit their paperwork correctly. I had photos to show the adjudicator but he suggested I shouldn't let him see them because I might prove the other side's case.)
There's an appeal process. Read the small print and go to a specialist site like pepipoo for the current procedure. If it's how it used to be when I appealed a parking ticket on a red route, you end up putting your defence at a 1 to 1 meeting with an adjudicator. I don't know whether you lose your right to a discount if you appeal. (I got lucky. The other side didn't submit their paperwork correctly. I had photos to show the adjudicator but he suggested I shouldn't let him see them because I might prove the other side's case.)