DQ Track - very disappointed!!

We've had problems with the DQ Track device since it was installed in our Fiat. The device has been replaced but on the night it was replaced we could not switch on the lights or all the gauges either went up or down. Contacted my broker and an other technician came to check the device. I requested the device be removed as we are selling the Fiat. Technician says device is not the cause of the problem but I never said or imp**** that it is the device but something that the technician did. Discovery refuse to pay to get my Fiat fixed and I can't sell it like this. They are however very fast to deduct money from my account for a DQ track device even though it was already paid and they do it every time without informing me about it first. They are making sure my credit record goes down the drain with their deductions whenever they want to. I'm fed-up with their poor service and their lack of responsibility. Also not impressed with my brokers because they only inquire when I prompt them for information on this situation. Will be changing broker and insurance company before end of this month. I'd rather pay a bit more and get better service than this!! Very disappointed!!!