Damaging My Car, Not getting back, Double Charge

I had a Netstar early warning installed, Got quote R159pm because I had a Netstar ****h in my other car. Tech came out.. Did the install.. Damage my Car, I found Broken Clips on the Floor, Plastics being help by 1 Clip, after letting them know and being promised it will be sorted, they just lack to respond or call back with a Soulution, Second the Tracker dos not work.. or there is just no Response, I have driven over 60KM with out switching of the Early warning and not even a Phone call from Netstar, Then lastly.. now the want to charge me R275pm after being quoted R159.. I'm Done I want this **** out of my car... and my car fixed and my money back!!!