UNSOLICITED CONTACT BY AGENTS FROM STANDARD BANK

I am fed up with companies calling me "on behalf of Standard Bank" to tell me that I have been pre-selected for this and that offer and card. I have NEVER done any business with Standard Bank and have never had an account with them. When I asked the agent, called Chadwin, how did Standard Bank pre-select me and based on what as I never lodged any request for any type of financial product at Standard Bank, he could not answer me. I asked to speak to a manager, but conveniently no one was at the office. I asked for complete details of the company that he worked for and the contact details so that I could send a letter of demand to stop contacting me, as I never gave permission to be contacted, and the phone was put down in my ear. This is also not the first time that Standard Bank, this is simply ridiculous. How many times do I have to ask you to stop contacting me!! The contact is unsolicited and without my consent. I am an attorney and I wonder how Standard Bank will feel when I start drawing bills of cost to send to them for my time spent taking these calls and advising over and over and over and over and over and over again that I DID NOT GIVE MY PERMISSION AND I AM NOT INTERESTED. I request that I be contacted as a matter of urgency to explain why I am being contacted without consent.