Mixtelematics - Contradictory Information Received

The unit on my car is 5 years old and is not within the contractual period as confirmed by Mix Telematics. I’m on a month to month contract as the unit is paid up. I sent a request for cancellation on 25 November 2020 as my car was being sold with a pick up date of 30 November. I followed up with a phone call and was told there is a one month notice period, but when they checked on the system, I was told cancellation would be immediate as I was no longer in the contractual period. Yesterday I received an email saying as per conversation telephonically there is a one month notice period as I am still within the contractual period. This was in direct contradiction to what I was told telephonically.

If you are not within the contractual period, cancellation should be immediate like car insurances. Why should I pay for a month for a service that’s no longer in my possession. When you sell your car in most cases the car is taken almost immediately upon the purchase price being paid.