Who called from 6475550149

Call had some automated computer voice telling me something wrong with my US Bank debit card, then to wait for the security dept to provide more info. I don't even have a US Bank account. Obviously a scam and based on this, they have been at it for some time. Hung up..

They called to tell me my PC had viruses on it.  I told him thanks, I'd take it to be fixed.  He said I was welcome and hung up.

Called me about my windows program had a virus. I told them that I wasn't on the computer and then they hung up me

Caller ID:   DIR ASST ON
What the heck is that?  I ignored the call; they hung up when machine kicked on.  After viewing the other comments for this number, on my blocked list it goes.

UPDATE:
Caller ID:  DIR ASST ____ Last two letters vary - here are the ones that I have received over the last two weeks or so:
281-555-0116 = TX
647-555-0149 = ON
716-555-0156 = NY

I decided to answer the latest one today and it was "Hello, I am ___ and you have a problem with your Windows Computer"  (or something like that).  I then said, "We don't have a computer" and HUNG UP.

Now I am going to see if our call blocker will accept an entry to block the Prefix.  It has a Name Blocking function but the name needs to be the SAME - this one varies by the last two letters; but I blocked the Name anyway just in case any others try to get through from same area.