Unfair service from Altech Netstar

<p>I bought a car and installed Netsar tracker in 2013. For 3 years they were deducting +R300 from my account. When I queried it, I was told that there are added value services that they were deducting for. I requested a call or documentation on when did I agree to those terms as I was only aware of the tracker and not those other added value services. I requested assistance from management, but instead I was given a run around until I gave up. I sent a cancellation letter with immediate effect. Now I am recieving numerous calls and sms from their collection department. This is very unafair as I am still waiting for someone to assist me, but instead they do not care. They are threatning to hand me over instead of trying to atleast help or listen. I am not happy with Altech Netstar</p>