Harassing phone calls

Over the past 2 days I have received 4 calls that were either cut off as soon as I answered or only rang twice before I had a chance to answer from the telephone # ***.<br> When I eventually did get someone on the other end I could barely hear a word they were saying due to a very thick accent and a huge amount of noise in the background of people talking and shouting.<br> The lady had my name and surname and proceeded to tell me she was calling from Virgin Mobile, I have never had any dealings with them so I told her I wasn't interested in any sales offerings. She then asked me why I was not interested and said \do you know how much money you could save?".<br> I told her that I was simply not interested but she persisted"