Harrasment spam calls

Standard Bank keeps calling my work number when I answer they cut the line , when my colleagues answer they speak and advise I need to call them back. I spoke to Randy from standard bank call centre and asked why do they keep calling me as I do not have a loan or owe Standard bank any money I closed my bank account with them 5 or 6 years ago. I went in the branch and closed this bank and now I am getting calls that i need to pay for a service i dont even use? I have never shared or allowed 3rd parties to call me for marketing. This is an infringment of my private information as per the POPI Act.

I do not appreciate this, stop calling me and remove my details from your system as I will not do business with people who lack courtesy and decorum.