not getting my money back

WesBank asked me to send proof of insurance for my vehicle I have financed with them as they need to do this regularly to make sure their vehicles are insured. I have sent this so many times, I am currently insured with Discovery and have been for a while, I sent theme these documents, and yet they have been charging me for insurance extra on top of my current insurance for months now as they say they have not received my documents. I confirmed this email address they have given of where I should send my proof of insurance to with several people on the phone when I called in as I still get charged every month for insurance I don't need!!!!! I was told I will get my money back and someone will call me once I send my proof of insurance again, I'VE SENT IT AND STILL NO CALL BACK AND NO MONEY BAC****!!!!!!!!!!!!!!!!!!!!!! I'm tired of struggling and need someone to HELP ME THIS TIME. I have had such bad service and I will have my finance reviewed with Absa, which they offered to do a while ago as they promised to give me a better deal and I will be taking up that offer. I'm just tired of struggling with this now.