Wrong premium

I have been insured with Discovery for a while now. In July 2022,I bought a new car, called them to cancel the old one they had insured. On comparing premiums I chose to stay with them for the new car. They have since been deducting for the 2 cars R3700. I alerted them to this and in October. They saw the mistake, were to listen to tapes, requested purchase notes which I sent, even sent an email that I will be reimbursed in 7 days. This has never happened. They don't call back, are back at going to listen to tapes for the 4th time now. Deduction date is close they still haven't sorted this matter and will still make the same mistake.Discovery insure is proving to be very ***********, will NEVER recommend them ever