Bad service and not responding to calls and emails

I had a netstar tracker in my vehicle fitted by my insurance, after which i had some bad services with them I cancelled and then requested netstar to activate it on a month to month basis. Netstar does have a service where they fit a unit free of charge but you are binded for 36 months in my case they did not fit it . So after a few bad experiences with them I requested them to cancel my month to month subscription because I got better service from another company in my other vehicle. They then sent me an email saying I had a 36 month contract with them, which I then requested proof of such a contract twice and no response. now for the past few months I have been fighting with them as they are still deducting and the unit is removed from my vehicle a few months ago. The funny part is that when the unit was removed I did not even get a call from them saying they not detecting it or anything, but they still deducting. At least the other company that I am with sends me an sms and calls when detecting the vehicles battery removed or the vehicle being pushed, not once have I ever got a call from Netstar. Clearly they all about your money and not your safety. I have recently convinced my family to also not use them and will keep on informing people of their bad service.