Harassing the wrong person every single day!

My father is being stalked and harassed by this law firm for a debt he has absolutely no knowledge of, that was taken by someone else and not my father. He gets a call every morning at 6:30 and he’s always explaining that they have the wrong person, and yet the calls persists. It’s so annoying and it puts stress on him. This level of harassment will be dealt with, not to even mention that violation of POPI. Resolve this asap or I’m taking this even further.