Bad experience with Netstar

Goodmorning SA Netstar is not reliable every month I’m paying but I have a panic button sometimes will test it then they will call me and tell that I’m in Limpopo and from the day I bought my car I never went to Limpopo and lately I will receive alarm message that the car is moving while I’m asleep at 1 am and I reported they came 3 times now to Change the unit but the same thing is happening I have a bad experience with Netstar wish to stop it but 24 months contract is binding me but yoo is so devastating please help SA in all of those 3 days when they change unit u must be absent at work and at the same time my efforts are fruitless so help me God