Bad service

I have a bad service from zanele mpele I called one of my car was in an accident and it was towwed. I called in to find they whare about of my car I was told they can't pin point the location as the ignition it's off so they can only disclose once the ignition it's on.. The car was declared a write off in July and I called in for them to take out the unit which I was told it was removed and even paid for the de-installation and instalation... I continued to pay as I have a contract with them even though I don't have car. Fast forward I bought a car made arrangements to instal a new unit... The day I took the car I was called by the technician adving that he has a wrong job card and his job card state that he needs to de instal a unit on my precious car who which was a Mercedes and aslo fit in on a new Mercedes . I called them which it took me 2 hours with them in the phone explaining that I don't drive a Mercedes anymore but a VW and also the unit they referring to was de-installed in July as we in November... They wanted me to reschedule while I left my car at their fitment Centre in eastrand mall. When I was finally fed up I asked to cancel which I under up speaking to a rude so called team leader by the name of zanele mpele whom told me I need to pay for cancelation of the contract... I asked why cause you guys are not delivering what you promised as you couldn't locate my car when I called in..2 I had to beg for a new unit to be installed as if they are the only company.. 3 I had to fix the mess which they did by booking wrong job card which I was spending my airtime.. 4 why must I have a unit where it can't help me if my car is being towed.. 5 I need to give them the location of my car so that they can go remove a unit which I was charged in July... She could not meet me half way with my frustration they only thing she cared about was making money for the company as the only solution she was was for me to cancel and pay the cancelation fee so now am stuck with a unit that doesn't provide what was promised to me.. Am just paying for the same if paying