Harassment for somebody else's account

I have been harassed for over a month now for a Finchoice account that is not in my name. I receive up to 5 calls a day from Credit Worx looking for someone else. Every time I tell them that person is not me, and that they must remove my number for that person. Yet they keep calling me and send me smses with payment requests. I have reported this to Finchoice, and they have even sent this to their legal department. I have now reported Credit Worx as a result of the POPI Act where my personal information has used *******ly for somebody that is not me. I trust the law will now sort you out because your staff are incapable of doing it.