Xfinity Mobile Bait and Switch Promo

I moved my T-Mobile lines to Xfinity on the basis that I will receive $300 gift card for each lines. The Xfinity agent I spoke to on 11/19 was Jayde with ID# 10239469 and she processed the order and clearly said I will receive a total of $600 for both lines. I called just a week later on 11/24 to activate both lines and the agent I spoke told me I was lied to and was to only expect $100 per line for a total of $200. This is a clear case of bait and switch, and complete lack of integrity on Xfinity. Suffice to say that I will be cancelling the lines and going back to T-Mobile even if I have to pay more each month. Misleading and defrauding customers is no way to do business.