Relentless Direct Marketing and Sales Calls

I cannot recommend a company that has such little regard for people's privacy and time.

African Bank, either directly, or through third party entities calling on its behalf, calls and messages me incessantly on various private numbers. It does not matter how many times I tell the person on the line that I am not interest and that they must remove my number from the database, the calls continue! At this stage, the relentless direct marketing could constitutes harassment. Should this continue, I will have to take legal steps to force African Bank to stop calling me because it simply does not end!