Where are my promised promotional gift cards

Beginning in October, 2023, I had multiple conversations with Keith about switching our five business lines from Verizon to Comcast mobile. He told me I would be eligible to receive a $150 gift card per line that was transferred. We were able to complete all of the required steps and had all of the lines moved over to Comcast in December 2023. Since then, I have contacted Comcast support multiple times to follow up on the gift cards and have been given the runaround. Most recently I was told the original sales rep was supposed to email a form to me to complete to receive the gift cards. Apparently this was never done and I was told I would need to contact the original sales rep to START the process. Before I ever contacted Comcast support, I tried to call Keith, my sales rep, multiple times. He never answered my calls or returned them. Today I called Keith’s direct line and received the voicemail of someone else. Apparently Keith is no longer there. 

What am I to do? To say I am frustrated and fed up with Comcast is an understatement! At this point, I just want to drop everything we have with them, personal and business, just because I feel misled and deceived.

Can anyone with this company actually help me find a resolution?