the dude
Striker
Not sure about with private companies. But when it comes to Local Authority parking fines you can't pay and appeal. As soon as you pay you accept the fine.Bit daft not paying it tbh, best advice is to pay it and then get a refund when you win.
You probably will win, if as you say you've been using it and paying and can prove the machines were knackered and you paid ASAP.