Blake & Associates - Harassment even after explaining they have the wrong number 4 calls per day.

This call center is HARRASING... I am furious. From the beginning of this month they keep calling me. I was put down as next of kin for someone and do not have anything to do with you. I have explained this over and over. I am receiving 4 calls every day from as early as 7:30 in the morning. I am sure that the company that gave my number to them are not adhering to the POPI Act as they gave my number to them. What is even worse is that the person that they are looking for as already send them proof of payment. What is my next steps. I am working and they are calling me in between meetings.