I have been with Cartrack for 3 years and served a notice of 21 working days of cancellation instead of them to send a letter of confirmation for cancellation they send overdue notices, and I have received 3 emails from different people in a day after I e

I have been with Cartrack for 3 years and served a notice of 21 working days of cancellation instead of them to send a letter of confirmation for cancellation they send overdue notices, and I have received 3 emails from different people in a day after I explained to one of their that I no longer their services but they says I am in a month to month contract, and I cannot deal with the issue of reversing debit orders.