Absa Vehicle Insurance

Absa has taken out an insurance on my vehicle and invoice me for this altough i have my own insurance. Proof of this was sent to Absa through my broker. Every month they are charging me over R 2000.00 for this insurance. I tried calling Absa to resolve this with no luck. I also asked them via email to contzct me with no luck. Everytime they send a mail back to say that someone will be in contact with me. This now is going on for almost a year and i need this money to be put back into my vehicle account which now is in arears because of this. Please help