$100 gift card is a joke

Good afternoon I'm a new customer at xfinity mobile. An expenditure representative promise me to get a $100 gift card for each line I move over to xfinity. There were 2 anxious to make the deal didn't explain anything to me.  I've been waiting 4 months finally called customer support they told me that because I open 2  Phone number lines I don't qualify for the promotion. I told them they never told me this. They said sorry we can't do nothing for you have a great day. Xfinity let me give you some advice if this is the way you treat your new customers you're not gonna get very big in life