No respect for POPI Act

These guys are calling me on a daily basis and when I pick up there is no one on the other side. I think they do this in-order to charge calling fees. I have told them numerous times that they should stop harrassing me as I don't have any outstanding accounts. The outstanding amounts all relate to someone else. Each time when I call they indicate that they will remove my number but then I just receive calls on the following day. I have written this on Hello Peter now so that I have this in written format.