Continuous harrasment

This company has taken to harassing my business on a daily basis. It happens over 03 times per day currently. We do not have any business/accounts with them and when I advise that they have the wrong number and that the person they are trying to reach is not (a) a person employed with us or (b) a person associated with our company at this time, they advise me to forward the details of the person associated with their books.

For a legal company they should know that this is ******** practice and in breach of POPIA. When I personally advise their call center of this fact, they "didn't know that it was against POPIA".

I am not about to forward any details of anyone telephonically, irrespective of if I have any relation with them or not.

This harassment has been going on for 02+ months with several days of multiple calls.