Selling insurance I did not give permission

So I'm getting phone calls from Standard Bank. I did not give permission for them to call me. I have received other call center phonecalls from other companies and the details they are providing me about my self point to information that I only gave to Standard Bank.<br> <br> How does a company like this sell my information without my permission and continue tto harass me to buy over costed insurnace products?<br> <br> When they phoned me I asked to speak to the manager. Was told that there is no manager available.<br> <br> Then I get transferred and they hang up the call.