Heads Up: Xfinity Spoofing Scam

Heads up about an Xfinity Spoofing scam that I experienced yesterday.  I called Xfinity CS yesterday regarding my account and, while on the call, I got an incoming call that went to VM.  After my call ended, I checked VM and it was Xfinity giving me a callback as I had requested.  I did not recall asking for a callback, so I deleted the message.  But a few minutes later, I got another call from Xfinity saying it was the callback that I had requested.  I figured I better answer or they would keep calling me.  The person was a woman asking what I wanted and I explained that the matter had been resolved by CS.  She said that she could check it for me, and asked me for the last 4 digits of my bank account associated with my Xfinity billing.  I said I had no idea what those digits were and she then asked for the last 4 digits of my Xfinity account, which I also had no clue about.  I said that the matter was resolved anyway and hung up.  I then thought it odd to ask for those digits, and so I called Xfinity about this.  Long and short is that it was not Xfinity that had called but a scammer.  Believe me, it seemed all legitimate.  The number spoofed was 1-800-934-6489, which Xfinity told me is an Xfinity number.  How they knew that I called Xfinity CS is a mystery, because obviously their "callback" scam depends on knowing that the customer had called Xfinity.  They got no information from me other than my name and phone number, thank goodness.  And I alerted Xfinity about this scam.  So heads up!