Xfinity Target Scam

Almost got scammed.  They texted and called (using [Edited: "Invalid Phone Number"] Orlando, FL) me then left a messaged saying my current promotion is removed. Call them back if I want to keep the discount. So I did call them back.  Then verified just my address.  After that they were trying to promote the target scam.  $900 upfront to get that $15/month for life promotion.  The catch is to pay first 5 yrs in advance ($900).  They said I will have a free Apple Watch as well and another $75 cash back from Xfinity when paid within 24 hrs.  Told me to get Target credit card or target gift cards. I asked if I go for card credit, they said I should go to Target and apply for a credit card but I had to pay a fee for the cc. Then I picked gift card then they told me to buy from Target. Buy 3 gift cards for $300 each. Once I have the gift cards, call billing department @ [Edited: "Invalid Phone Number"] and my confirmation is [Edited: "Personal Information"]. They said they will waive my next month fee ($25).  I did receive a real thank you payment confirmation from Xfinity. (Is my account being hacked? How did they pay) After that, I received a text from [Edited: "Invalid Phone Number"] saying thank you for signing up with discount and pay the money by call that billing department.