CARTRACK TERRIBLE SERVICES

I AM PAYING FOR A SERVICES EACH MONTH AND THE DEVICES IS NOT WORKING PROPERLY

GETTING BATTERY SIGNALS WHILE WE ARE BUSY DRIVING, THE CALL CENTER PHONED US MULTIPLE TIMES , THE CALL CENTER AGENT WAS INFORMED THAT THE DEVICES WERE FAULTY,

I WANT TO CANCEL THE SERVICES AS I DO NOT GET WHAT I AM PAYING FOR, SO THE LADY TOLD ME TO PAY A CANCELLATION FEE, HOW DO THEY EXPECT ME TO STILL PAY THE CANCELLATION FEE, IF THEIR SERVICES IS NOT UP TO STANDARD AND THE TRACKERS HAS NOT BEEN WORKING AT ALL FOR THE LAST 2 WEEKS.