Xfinity false advertising about visa gift cards

I switched to xfinity mobile last fall. The xfinity rep at my local store told me if I got other people to switch we could all share data on a by the gig plan and each person would get a $100 visa prepaid gift card. The xfinity sales rep I talked to on the phone confirmed this was true. I got three family members to leave Verizon and join me on the shared data plan and now xfinity tells me we only get one $100 gift card to split among the four of us! Xfinity needs to be accountable for the promises their sales reps are making. This is clearly bait and switch!