Standard bank took vehicle insurance with Hollard on my behalf without my consent

I noticed that Standard bank took a hollard insurance on my behalf without any consent, while I have my own insurance. I contacted them and even sent them a proof of insurance on the 29th of June 2022, they never refunded me. when I call I'm always told that the refund is with the other department (Insurance department) when I request the contact details for the department then they stop speaking.