Relentless spam calls

I am called relentlessly all day long despite never having an account or anything to do with African Bank. I answered a call and told the lady on the line she had the wrong number and to please stop calling me. I was told only the person who she was trying to call could change the number and they continue to phone - what sort of a dumb system do yo have in place?

I will continue to block and report all the numbers you call me from as spam.

If you want to sort this out send me a name and a direct number for me to contact.