Tracking rescheduling

I'm not happy with the level of service I've received from car track. I've called them since February to check the positioning of my car because I could see that it's not working on my app. I was told it needs a repair and it's R600 if they repair it so I took a debit order option where they debit R30 every month. I've been calling for scheduling and I was told they will call me, no one called me. I had to call everyday to get a date with no resolution. Yesterday I spoke to Thabang and he told me that my car is scheduled for today at 11am only to find out today when I called at 11am to check if the technician is still coming and I was told that there was no booking for me. The only available date is in April so I can't wait any longer since I'm using this car every, I even took a day off today thinking that the technicians are coming. I even canceled my contract with them because I'm furious.