I didn't see the match, but I've readt about another "cheating" episode from Vika, against Sara Errani in Doha QF.
At some point of the match (I think in the second set), a ball hit by Vika is called out, but after the challenge (ball was in) the chair umpire gave the point to Azarenka.
Then Errani says to the umpire that she did hit the ball, so the point should have been re-played. Chair umpire then admitted she didn't remember if Sara hit the ball and asked Vika to help her out but she wanted to have the point won.
I repeat, I didn't see the match, so I cannot express an opinion about that.
Ok I found the video:
http://www.youtube.com/watch?v=KYeOBmDm65EMinute 17.15