An apology doesnt mean a damn thing if the situation is not rectified, the apology only means something if the refs are sanctioned for continually making these bad decisions in order to favour united.
Also why isnt the ref coming out and saying why they have made that decision, what was the criteria in which they chose not to give it and then when they say why they didnt give it they will be shown as incompetent in which case they shouldnt ref again or cheating and the same conclusion.
Refs should not be protected from up on high.