$200 gift card not received, it’s been more than 3 months

I am very disappointed with the way Xfinity treats their customers. In March, an agent told me I would receive a $200 gift card if I purchased a phone and added a line through Xfinity mobile. She told me I would receive it after 90 days. It has been more than 90 days now and I have followed up on the gift card several times with no luck. Everytime I followed up, there’s been inconsistencies with the responses; some agents told me I should have received it by now while other agents told me there’s no such promotion. I see that multiple people have had the same issues and I’m wondering why Xfinity is doing this to their customers? My bill is always paid on time as the payments are automatically withdrawn and they cannot even fulfill things they are promising to customers. I have invested so much into Xfinity yet they do treat their customers poorly. Considering cancelling my services, I have tried to get help on this multiple times with probably 10 different agents yet nothing has been resolved.