AT&T and Direct TV / direct t v

This is quite simple, I spoke to a gentlemen named rico to sign up for direct tv. Rico promised $150 gift card upon completion of the first 30 days of service. After 60 days I spoke to lucious a supervisor at direct tv, I was told I did not qualify for the gift card and that many at&t and direct tv representatives will lie in order to get people to sign up. I am not complaining about the $50, the $25 or the $48 dollar discount I did not receive (I expected not to receive them), however, by the representative initiating the contract, lying to the perspective buyer he has invalidated the contract as a whole. This in fact leads to me having no contract, and the clause that disallows class action lawsuits to be denied. So I ask this simple question to at&t before I go public, is this really worth my contract? If my contract is invalidated by at&t and dropped I will pursue nothing further.
Sincerely
Richard monroe