Misleading, Harassing Phone Calls, Scammer

Has been calling my 85 year old father sometimes 8 times a day for the past almost 3 years. Chooses to be all kinds of different very American names and claims to be FBI, Doctor, PCH rep, UPS Director etc etc, claims he has won millions but needs all of his personal  and financial info, or tries to rush him to the nearest WalMart to purchase a money card or to get money out from Western Union to pay for the fees so he can get his millions and new Mercedes, etc etc. He is scum and very persistant. He also is very crude and verbally abusive when you say no or ask him not to call. Please get this guy.