UNFAIR TREATMENT

I had a tracker device installed yesterday and now my car is making sounds every time I drive, my car was running smooth yesterday when I came to work, I am sure something was touched yesterday during the installation I then called the call center and they said a technician will came and if it not car tracker related I will be charged R200 call out fee ,then I have to fix my car, how do I fix my car when all this started just after the fitting of their device I have been a client for 4 years now I never had an issue with the 1st installation that's why I signed another 3years contract last week and had the new device installed yesterday ,but with the service I am getting now, I am not even sure if it's safe to drive my car or I must wait because I am not sure what damage i will do if continue to drive it with those sounds coming out, I am to mechanical smart, I am just a woman driving a car, I won't know what the sound comes from, what I know is my car my running smooth yesterday . I logged the query yesterday around 17:45 and I called again today at 7.45 as I need to drive to work but am told it will take 48 hours.