Shocking Service from Mix / Matrix / Beame.

I have had the most appalling service from Mix Telematics / Matrix / Beame, I requested cancellation of my contract in August when I sold the vehicle linked to this contract. The agent informed me that a cancellation fee would be payable. I said that I would be purchasing a new vehicle very shortly thereafter, and at the agent's recommendation kept the existing contract running. Mix Telematics debited my account in September, October and November (while I had no vehicle, ie, no device required). When I purchased my new vehicle late in November, I phoned Mix to find out where to have the new unit installed on the existing contract. I was then informed that I had to cancel the existing contract before I could start the new contract. I said that this was contrary to what I was told in August. I said I would be happy to pay the cancellation fee but then I want the fees paid after I had initially requested cancellation refunded to me. I was promised that the call recordings of the conversation in August would be listened to and that I would get feedback. This has not yet happened. I received an email initiating cancellation, and I paid the cancellation fee. I asked for feedback on the deducted premiums. Then Mix debited me in December AFTER cancellation I have not yet been able to get through to the Mix Telematics call centre. None of my emails have been responded to. Mix has given me conflicting information, and owes me 4 months of premiums.