I've used the pay by mobile service for my parking, but I've received a parking charge notice (PCN). What should I do?

We're really sorry that you have been given a PCN when you think you shouldn't have. To resolve the problem please contact us as soon as you can. Our address is: National Car Parks Ltd, Notice Processing, PO Box 839, Northampton, NN4 4AL. We will respond to your letter within 14 working days after the day we receive it.