can not activate peacock

I have the 1.2 gig internet with the 2 yr peacock premium. I have had no success getting it activated.  I have been on several phone calls to support and support chats too.  I keep getting a message that I am not eligible for the promotion even though I have 4 emails telling me to activate my subscription.  I was told by an agent in the Xfinity store my account was coded wrong and basically I was out of luck. I am beyond disappointed in Xfinity. I have other free subscriptions through other services and it was so simple to set up.  I just feel like I've been deceived about the promo