Received wrong order - No assistance/proper customer service

I recently got a vehicle and contacted cartrack for a dash-camera and a tracking tag. I specifically informed them that i only need those 2 and not the tracking unit as the vehicle already has a tracking unit with Netstar. On the day of the installation when i arrived where the technician was with the car, i asked whether it was just the dash-cam and tag that are being installed he mentioned that its the tracking unit as well and he had already installed it according to the order and job card. i have been calling car track till today and every day my airtime gets finished without even getting any assistance, they keep saying they need to get the recordings of the day i placed the order, they cant transfer me to the fitment department. I hold for a very long time after requesting to speak to the supervisor or manager and have never spoken to either of them till today. I have been requesting that they come and remove the tracking unit because it was not part of the order. They are debiting a lot of money from me for something i didnt need and now that i need it removed and the amount rectified i am being given the run-around.