Computer Help and Support

..as "800 533 8571". (Searching the number without the spaces primarily picks up phone number website gibberish. The quotes avoid partial matches.)

The top two results referenced something called Intoiit (in the Google Search summary: I didn't click on the links). Searching that led to a company by the same name in Dhaka: IntoiiT Bangladesh Limited, which Google says was first indexed by Google in April 2013.

Of course, that doesn't mean that they sent you the email!