Old Mutual persistent harassment

If I could put 0 stars I would. This company has consistently harassed me with unsolicited phone calls for months. I have formally asked countless times for my information to be removed which I believe by law requires them to remove your info yet the calls continue and seem to be ramping up even. Each time I'm called no one can tell me how or where they got my information. I require a representative from Old Mutual to respond & prove to me where they got my information and since I have formally requested the removal of my information multiple times they need to show that they removed it and that I will not be subject to further harassment. Enough is enough