Horrible service by a service provider I use to trust

We received the worst service and we believe it will only be fair if they returned all our premiums. Our car crashed, the so called service provider did not detect any impact alert, I further pressed the panic button, no one called from Netstar tracker. I then decided to call their call centre the following day only to be informed that their device must have been faulty because it did not even detect the whole trip on the day of the accident. I then told then to cancel their useless tracker subscription and that we are not going to pay any amount further, I was told that they will get back to me to date. Please pay back all the premiums