Unsolicited Sales - Cold Calling

Unsolicited cold calling for "fiduciary services". The sales agent could not explain where they got my number beyond that she got it from their "lead generation marketing team". She said someone must have recommended to them that they contact me. She was unable to tell me who allegedly make this recommendation. She did not have any details except my phone number - not even my name. So I do not believe that anyone passed my details on to them - it seems that they just cold call people. It's a complete nuisance to get these kinds of calls while I'm busy at work.