Help me recover my money and cancel cover with Kingprice.

Please help me cancel cover and recover an amount of R895,59 which was wrongfully deducted from my bank account by this company. In the past week or two I tried cancelling the cover I have for my vehicle with Kingprice with no success at all. I emailed them notifying them of my need and reason for cancelling cover. I even called them and was told that the policy is still active and was promised a callback which did not happen. I no longer own the vehicle as I have given it up for trade-in on the 23 June 2021. They deducted the money for cover on the 2nd July 2021. I need help in resolving the matter plzzzz.