*********** staff and no answer to phone calls

Why is it that i need to take to Hello Peter every time i require service from Matrix. In the past 2 weeks i think i must have called Matrix just on 5 times trying to cancel my contract. Not only do i hang on the line between 10 to 15 minutes as the cancellation department just rings continuously and than the call ends i try and call back same thing happens. Only reason for me to cancel my contract is because the engine has been taken out of my vehicle since January we are awaiting parts and it doesn't make sense to be paying for tracker if my car will not be on the road until December, . I have 2 contracts with Matrix and only require to cancel the one. What procedure do i need to follow just for someone to either assist me or to damn answer the phone seriously Mix Telematics is this the after care service that is provided to all customers????