Why not inst. should cancel cost fm paper ??

Last time icai canceld cost fm paper due to littile printing mistake in instruction of hindi medium question paper which was not a big issue then why not icai should cancel this paper. . . Here a big blunder mistake in paper. Q.P not contain 50% portion of costing and contain 70% from fm. I THINK THIS IS A BIG ISSUE WE NEED TO LOOK THIS. . . BE CAREFULL IN IPCC TAX. . . . . . . . . . Can we should ask the the same from icai through e-sahyata or not ?? Reply ur view. . .