keep receiving calls from this number trying to sell long distance, wont stop calling me even when I told them not to call, is there a way to stop it ?

Called my cell phone on a Saturday to sell long-distance telephone cards/scam.  Kept calling back from other numbers (same area code) when I got angry and told them to not call anymore.  The person said his name was Binod Rai, was very hostile and cursed in Nepali etc.  Such an embarrassment for Nepali immigrants in the U.S.  I hope that guy becomes a statistics to the corporate overlords of the prison industrial complex.  He deserves intimate moments with an inmate named Bubba, down there in Florida.

Received call at 11pm and an Indian marketing person introduced himself from "Union telecom" offering promotional international calls. I told him that he woke me up from my sleep and closed the call. After 2 mins he called me again and simply disconnected without speaking as if he was taking a revenge on me!
Such a crook...!!

They are so shostile annoying and rude and they are persistent.

Does this device works for cell phones?