Who called from 2102399317

Roger with WSG Tech who had a strong accent called telling me that my computer had a lot of errors.

Jimmy gave me this number and said he was with microsoft and I had a lot of problems on my computer. I hung up on him after a short time.

this is a genuine company...
i already with this company

You already... what? with this company?  I can take some educated guesses:

You already SCAM with this company
You already LIE with this company
You already STEAL with this company
You already SHILL with this company.


Microsoft will NOT call you about your computer; only scammers wanting access to your money and your computer will.

http://www.microsoft.com/security/online-privacy/avoid-phone-scams.aspx