Harassing me for someone elses debt issue

I keep on getting unsolicited sms that I need to pay discovery a certain amount. The tone of these sms's are highly threatening. Secondly this is for another consumer, and the person's whole debt situation is disclosed in detail in the sms.This can't be compliant with the NCA regulations? Should MBD not ensure that they have the correct contact details before they send these confidential sms's to people? I also got calls from them and I explained I am not Mr. X but they keep pushing. I also phoned to complain as I am horrified at the though of companies like these sending out highly confidential personal information of other people to the wrong person. The call centre lady told me that ? must give them the individuals details, before she will remove my number. What happened to POPI compliance? What would the NCR say of this? I want a solid explanation and an excuse from MBD for the treatment I have received and I am certain that the individual who actually owes the debt will be extremely upset to know that his highly confidential information are sent to a completely innocent and unrelated person? BTW my credit score is perfect. So I find this shocking to say the least!