Paying for non existing tracking device

I have been on cartrack for more than ten years even though I always have challenges with them but I have been patient with them. This time around I'm feeling tired I phoned them February 2022 and they said my track is faulty, they have to install a new device on car and I have to pay R600, they gave me two option to pay and I did. But till today am driving a car with no tracker, I have done number of follow - ups with head office and KZN Durban branch, they always promise to get back to me but no one did.