CANCELLATION REQUESTS IGNORED

I have been a client with you since 2012. I sold the car in July but I am still being billed. You don't respond to emails or queries or calls. If I do eventually get through to the call centre agents tell me they can't process cancellation requests, and that it has to go through a specific email. The numbers on the invoice are 'out of order' There is no email on the invoice and the one Ive been given has changed twice and to date has not been answered. The app wont load so I cannot cancel through that method. You guys don't respond to any communication. Very disappointed as I was considering renewing on the new car but definitely won't do so now. As of today still being debited monthly.