That's tough. You are going to be very close to the 3.0, even a 1/2 letter grade change may get your B.. so it is worth talking to each of the professors. Tell them the story & ask to double check the grade, possibly even re-review a critical final exam. I would suggest the diplomatic route as opposed to the "you screwed me" approach.
If that fails would personally talk with the scholarship administrator...maybe they will cut you some slack if you get 3.5 or better next quarter..or something.
You seem like a responsible person, I think you've got a shot. You have nothing to lose by trying..
