I have this same problem! I've asked them nicely to please remove me, cursed at them other times & even told them I had died & NOTHING stops them calling me. Every once in a while they also call me from an "unknown" number.
They've been calling me forever. Middle East accent, but their names are always Bill or Jim or Mike ! LOL. They say they are from"Your pharmacey" and your refill is ready. They use numbers from all over the country or unknown or unavailable. I always play deaf, or I speak only Swahili or I asked them if they are talking code and want to include me in some sort of criminal activity. Sometimes I tell them that the DEA is all over the place and we better shut down...or the best is I tell them I need cases of what ever it is they want to refill cause I have a market that will pay 1000s of dollars. I tell them I will pay all in cash but I say I need to come pick it and I will come anywhere they want to meet in the states, but I will be armed and so will my bodyguards! Then I start asking all sorts of outrageous questions..they start putting other people on the line...get all flustered and finally after I tell them I will wire them 1000s of dollars, I pretend I lose the connection...funny as hell !