Salsa, I don't blame you at all for feeling that way. I would be lying if I said I wouldn't be pissed if the shoe were on the other foot.
Believe me it's happened to my teams:
1976: Patriots lose to the Raiders in the playoffs when Ben Dreith throws a questionable (at best) roughing the passer penalty on Sugar Bear Hamilton on a 4th and forever play, with about a minute left in the game and the Pats clinging to a 21-17 lead. A few plays later Kenny Stabler scores........Raiders win 24-21 and go on to win the Super Bowl. The Raiders went 16-1 that year (including playoffs). Their one loss was to the Patriots, 48-17 in week 4.
1979: Stanley Cup semifinals: Canadiens-Bruins tied at 3 games a piece. The Bruins are clinging to a one goal lead in the Forum against the three time defending champions. The refs call a phantom too many men on the ice penalty (Don Cherry to this day calls it the biggest BS call he has ever seen).....Canadiens score a PP goal to tie it and then win it in OT. Of Course, they went on to their fourth straight Stanley Cup title.
Those are two most notorious in these parts, but there's been others.
My point is, I don't blame you one bit being upset about that stupid rule.