2 Weeks+ to install a tracking unit!!!!!!

I need to cancel my contract with Netstar because I'm not getting help or service i deserve as a customer, its been now 2 weeks + since i asked them to do what they call D-REE and I told them that the vehicle that has the unit initially is sold to a dealer and I think that car has a new owner already , as I can still track it and it looks like a working vehicle since its a bakkie, so when I phoned the first time I suggested that they can just switch of the unit from the old car and install the new one on the one car i bought meaning I'm still continuing with the contract, today (31/05/2021) still no call from Netstar and today is the 3rd time following up I was told they will remove the unit from the old car and refit on the new car and that cost will be around R600 remove and refit and now they say they will just cancel the other one but I must still pay R600 i feel that's **************** especially I first suggested that and after waiting for over 2 weeks that's unfair so I need this sorted within 24 hours and I'm not paying a cent as this is their mistake and i was told it will take 24 hours, if its not done in 24 hours I'm terminating my contract and I will be not paying a cent as this a brake in their commitment.