repeated calls, seen on my caller ID

I received a call from "US Pharmacy" in which the caller would not give any further identification, or any means of contacting the company for which he was making the call.  Her persisted in asking me which pill I wanted refilled, the blue or the white one, or something like that.  The accent made if difficult for me to understand his words.  I persisted in asking for further information about the company, after which I would answer his questions.  At that point he disconnected without another word.