Horrible service from tracker and breach of cancellation contract

I bought a vehicle at vw constantia kloof and there after i was introduced to a tracker consultant,who briefly explain the benefits of installing the device in my vehicle. I them asked if there is a panic button and he agreed, I told him i need a panic button because I bought the vehicle for business purposes and it will be traveling at night.i took the device and a week later there was an attempted hijack on the vehicle were the driver was pointed with the firearm.He pressed the “panic button “ four times and the consultants at tracker kept on calling me when I advise them to go there because I believe that the driver is in danger seeing that he pressed the panic button and his phone was suddenly off. I was then told that the button is not a panic button it was an assist button for towing purposes and I should try and call the driver of the vehicle they will call me back. To cut the long story short i was never assisted by tracker that day. Lucky enough the driver managed to escape and drove to the police station. The next day I proceeded to the dealership to find the consultant who sold the device to me as there was misrepresentation in order for me to conclude the contract, had i known that the button was for towing purposes I would have consulted other tracking company. Unfortunately i was told he resigned however the lovely new consultant assisted me and I advised her that due to the fact that there was misrepresentation in conclusion of this contract i want to cancel the contract and be place in a position i would have been had i not concluded the contract. The contract was canceled however was not refunded the amount which was debited. I received a cancellation letter which indicated that the cancellation will ne effective on the 30th of April 2018. I then saw that the tracker app was not working anymore meaning that they have canceled it, i then decided to reverse the payment they debited from my account because they are in breach. My issue now is there fact that im now receiving smss from tracker stipulating that i owe them.And I called tracker to ask how because they in breach but didn’t get a proper answer.