Caller ID's beginning with the letter "V"

I’ve noticed these calls and I haven’t got one in years until about a month and a half ago. I don’t know if this person was a scammer or not, but this person mispronounced my mother’s name (not going to say her name due to privacy) and I falsely claimed that they had the wrong number just to get them off. It was a successful attempt. Who is behind all these calls and where are they located?