Matrix vehicle tracking cancels tracking without authorisation

I change my vehicles almost every year. I have all of them fitted with a Beame or similar tracking device from Mix Telematics. I sold 2 of my vehicles recently and asked Mix Telematics to provide me with an upgrade option for the remaining 1 and quote for cancellation on the other 2 as my replacement vehicles didnt need a tracking device as per the insurance requirements. Several emails to cancelations department to no avail. Then i contact the call center and am informed that they cancelled tracking on all my vehicles, which i didnt authorise, and they still debit my account for premiums - so what am i paying for? They apparently sent me a quote for cancelation to an incorrect email add. This makes you wonder if they will ever be able to assist you in the event of a loss !!!!