"The micro soft support scam"

Until recently I had not been pestered by these low lifes pretending to be "micro Soft support". However I have recently had a problem with my ADSL enabled phone line which has been on going for some months. Ever since I entered into discussion with my ISP about the issues on the line I am called at least once a day by the scammers. My other non ADSL line does not get any attention from them. My cynical mind links the scamming to the overseas internet support provided by my ISP.
Has anyone else had this experience or can offer a more logical explanation.