I AM BEING BILLED FOR A FAULTY DEVICE INSTALLED IN MY CAR

Hi I need credit for the last 2-3 months for the faulty device that was in my car. Please unlock my account so that i can test the new device that is in my car. How can you suspend my account when it was not my fault you put a faulty device in my car? I will only pay the outstanding amount once i have tested this device is working and i am happy. I am a paying customer to car track and i have been for a very long time now. To be treated like this is utterly disgusting. No one from Cartrack has phoned me to find out if my issues have been resolved but I get daily phone calls my account has not been paid. MY ACCOUNT HAS NOT BEEN PAID BECAUSE I HAD A FAULTY DEVICE IN MY CAR FOR MORE THAN 2 MONTHS WHICH I PAID FOR.. YOU SHOULD BE ASHAMED OF YOURSELF.