Sunoco review: hybrid credit card

Applied for Sunoco credit card, received it then a month or so later received a notice of this card changing to a "Hybrid " card, with two separate sections, oner for consumer purposes and the other for gas only, . No where did it mention (unless it was the usual super fine print)that there would be two separate payments due for one card. Needless to say when I paid one, I WAS UNAWARE THE OTHER WENT UNPAID, now having accrued several late charges I have closed this very confusing account, was told that separate payments for one card was the norm, but if I wanted to I could make the total combined payment due all at once. Huh? Anyone else out there think this is a shady practice and care to see about a class action lawsuit? if so email me at [protected]@yahoo.com