Matrix Reaping me OFF

I have been with Matrix vehicle tracking for 2 and half years, I got a call from them on the 4th of September that my contract is due for renewal. I inform the agent that i don't want them to renew it because i want it to be on a month to month basis because i am in a process to upgrade my vehicle. To my surprise yesterday i noticed that they debited me R278 instead of R216. I decided to call them to find out why they increased my premium. They have been transferring me from 1 department to another and no one knows what transpired for them to increase my premium. What a BAD service. I want them to cancel my service but i am finding it difficult to go through their cancellation department.