Bad services

I have had a very bad experience with car track from the beginning of my registration and installation and untill now I am still in the same situation. My situation started when they sent someone to install in their gadgets. I paid for a full package and they failed to install in everything.. saying someone else will come and finish up. And yes someone else came and realised the first technician missed something and explained he can't go on and he told me that I must not install the failed part because IT's usless and the car is a bit new they can't put it there... while I paid for it all. My car started having problems of starter that never been there and I called the first technician to explain but we ended up exchanging words. I fixed it and moved on... Fast forward.. it's been more than 2 and a half years now and nothing has ever fixed. But am still paying for it. Funny and sadly In jan I was late with my payment with only half of it and they switched off my system and threatened me that if I don't pay up they will cancel my plan .. imagine.. for 2 and half years and begging for their services to be right and nex... but they have a damn heart to threaten me with cancellations and all... at this point I am praying for my expiry contract date and be done with them.. you are the worse of the worse..