Discount on New iPhone17 Not Given

I purchased a new iPhone 17 from Xfinity which was ordered via an Xfinty store chat assistant with a discount of $400 paid as a monthly bill credit over 24 months.  Xfinity's offer  conditions on their webpage state:

"Offer ends 10/9/25. Requires qualifying phone trade-in, and purchase of any new eligible Apple phone while supplies last, a 24-month Xfinity Mobile Device Payment Plan Agreement (“Device Agreement”), and 1) activation of new Xfinity Mobile Premium Unlimited line within 30 days of phone purchase date or 2) phone upgrade on an existing Xfinity Mobile Premium Unlimited line and activation of phone on that line within 15 days of order."

So, I ordered the phone and upgraded to Premium Unlimited complying with all the offer conditions, but somehow the discount has disappeared.  I've had 4 customer service chat sessions and spoken on he phone to six different individuals with the last one indicating someone from an escalation team would contact me, but that didn’t happen.  It very straightforward and should be easy to resolve, but I just get the run around and bounced from one person to the next and get nowhere.

Is anyone else having this issue?  If so, how did you get it resolved?