Does Balaji fixed IPL match with Mumbai indians?

Balaji last over changed the match result. Balaji gave 23 run in 6 ball of last over and Kalkata loose the match. Last over by Balaji...

In IPL 4, Kolkata Knight Riders Vs Mumbai Indians 23 May 2011, match was almost in the favor of Kolkata, 6 ball remaining required run 21 in 6 balls, Gambhir selected Balaji to ball last over,

But Mumbai Indians scored 21 runs unbelievable. In last ball 4 was required but Raidyu hits 6 at last ball.

Run in each ball of last over by Balaji 4,4,4,4,1,6.

Should Gambhir should have chosen other baller instead of Balaji? Who fault is this to loose this match?