Keep Taking my Money while looking the other way

I bought a new vehicle from Toyota Bloemfontein in July 2017 for work purposes and needed to take out insurance from them in order to collect the vehicle. I Started work on the 1st of August and my vehicle got insured by the company since then. I then cancelled my insurance with Toyota Financial Services in August as it was being insured by my company and there is no need for double insurance. I received confirmation from TFS that my insurance have been cancelled in August but suprise suprise they debited my account for the insurance amount of R1360.70 along with my monthly car installment. Since then I have sent them countless emails and made phone calls weekly that were all recorder for quality purposes and so on. Every time I speak to them they say they will fix the error. Up until today I never received any feedback from TFS, I am always the person having to call them and the issue still havn't been resolved. It is 25 October today and they once again debited my account for the insurance today that has been cancelled since August. I am so frustrated and out of words I do not know what to do anymore regarding this please can you help me. They also said once it has been fixed they will only pay out 50% of the money because it is doubled insured, but that is unexceptable why do i need to pay for there incompetence. The full amount I have paid for a cancelled insurance adds up to R4082.10. I will be calling TFS once again to get this rectified but I do not have any hope. I have records of all the emails from TFS confirming cancellation in August and I am sure they got all my phone calls recorded on their system as they tell you on the beginning of every call.

Kinds Regards Christo du Plessis