Possible scammer impersonating Xfinity Assistant

I was using Xfinity Assistant to ask some questions.  At the end, they offered me a free mobile line for one year.  They soon sent me to a website that demanded my SSN.  They said it was to verify it was me, and Xfinity would never see it.  That makes no sense.  Making sure it's me is what the 6-digit code texts are for.

While I was searching Xfinity's web pages to report the issue, I got a Live Chat popup.  They again asked for my phone's IMEI number, and said the SSN request was not a scam.  This time I refused to give the IMEI number, and quit the chat.

Is this for real???  Why the he** would I need to give my SSN???  Have I exposed myself to hackers somehow by giving the first one my IMEI???