Purchasing of information and DMASA

I have received numerous direct marketing calls from Discovery directly, and indirectly through a Company called Merchants, selling discovery products. I am on the DMASA do not call me list. After requesting numerous times to please remove me off their direct marketing list, I was informed that my information was checked and that I was not listed. I was also informed that my personal information was purchased from various different companies. Please can Discovery supply me with these companies' details the information was purchased from, as well as the contract these purchases were agreed on. This is my personal information and have the right to request information on how it is distributed and purchased. I am not requesting an apology, I only request the information please.