CANCEL YOU POOR SERVICE

I HAVE A CAR TRACKER ON MY CAR FROM CARTRACKE COMPANY, THEY PROMISED ME IF MY CAR GET LOST THEY WILL CALL ME AND IF THE BATTERY IS OUT OF THE CAR THEY WILL ALSO CALL AND FIND OUT WHAT IS WRONG. IT HAPPENED THAT THE CAR GOT ****** AND THE BATTERY WAS OUT THEY NEVER CALLED ME, I HAD TO CALL THE TO FIND OUT WHERE IS MY CAR, FUNNY ENOUGH THEY COULD NOT TRACK MY CAR THEY TOLD ME THAT THE SERVICE ON MY CAR THAT THEY HAVE INSTATED IS NOT WORKING, THEY TOLD ME IF EVER I SEE ANYTHING ON MY SIDE I SHOULD CALL THEM BACK, WHICH I DID AFTER FINDING THE CAR AND AFTER DAYS, I CALLED THEY SAID THEY WILL COME REPAIR THE SERVICE THEY NEVER CAME TILL TODAY. THEY SAME MONTH I HAVE REPORTED THE CAR TO THE THEY HAVE DEBITED ME R600 AND I REVERSED IT BACK WITH MY BANK AND THIS MONTH AGAIN I HAVE REVERSED IT. I CALLED IN TODAY TO CANCEL THEY SERVICE THEY DEMANDING CANCELLATION FEE, HOW CAN I PAY FOR SOMETHING THAT NEVER SERVICED ME 0R NEVER HELPED ME WITH ANYTHING. CARRACK COMPANY IS REALLY USELESS AND I REALLY DO NOT RECOMMEND IT FOR ANYONE.