WHY MUST I PAY R600 FOR YOUR MULFUNCTIONING UNIT CARTRACK? WHY???

Called in to enquire about the app that has not been working since the weekend. Got different answers from 2 different agents with one saying it has been under maintenance since the weekend and the other telling me network is down today (7 May). When I asked why there was no communication the answer was not clear. I then tested my unit and apparently it hasn't been "tracking" since last week Tuesday. According to them I haven't been using my car since the 30th of April. And now I have to pay an additional R600 for them to repair THEIR unit that I am paying for every month. Why pay if I will still have additional costs? Do they think I have R600 laying around???? Why am I paying for this every month? Why must I pay the R600 for they unit that's malfunctioning?