Worst Comapny ever to deal with

Maybe I'm a complete idiot or they would have me believe I am, late last year in my good sense decided to sign up for a fleet management device/contract with Car track on one of my cars , firstly they schedule a date to do fitment, of which they don't honor and they don't call me to inform me they having issues I'm busy waiting at the time they set to come do fitment like a dumb ass, 2 hours late I call them to find out what seems to be the issue and luckly someone picks up and request a different date for fitment k, fine fast forward 3 weeks into my contract I pick up there is an issue with my tracker it's not recording data at times I send emails, and try to contact them to resolve with zero help or support from them. fast forward 2 months later they call me not to assist with my issue but they pick there is an issue with my account details and they calling me to rectify, after a long back and forth requesting they first fix my concern, as it would mean I'm paying for a service and device they doesn't work but they still insist I fix they issue first of which I do . a month later me still with the issue and paying for both service and tracking device that's as useful to me as male nipples, they finally call to come fix of which my car had a breakdown so I said they can fix it at the mechanics place or wait 2 weeks till it's out. two months later they call again my issue still unfixed and they forcing me to pay more money for something that doesn't work of which I asked PLEASE TELL ME WHERE MY CAR IS AT THIS POINT??? and they could not pick the location of my car which is 5 minutes away from they premises in pine town. at that point i decide to cancel my contract as they are utterly useless and have had the worst support I've gotten in my life to date. I cancel now they expect me to pay a cancellation fee of R1700, less fees that were waived and when I ask what is this for they refuse to tell me saying I agreed to this when I signed up. and when I explain, that my expatations were not met from the get go, plus I'm seating with a dead unit in my car they still expect me to pay them for what???

I'm not trying to be difficult but you can't expect me to pay for a dead unit that they themselves checked and told me yes it needs to be replaced .

fug this guys are the worst, I'm boiling here and they busy sending me they legal people like hound-dogs as if I breached an agreement when It was them who promised the world and failed to deliver, busy treating me with all kinds of legal action and blacklisting me . I'm so ****ed I'm tempt to just pay so I can close this chapter

I JUST HOPE THIS IS NOT HOW YOU CONDUCT AND SERVICE PEOPLE