BSNL — 2G speed on 3G Recharge

I recharged my mobile [protected] on 18 May 2013 with Rs. 599 3g Yuva Plan in which I got 4GB 3g data for night and 3GB data for day usage both data usage had been credited in my account immediately after recharge but when tried to use that 3g data i got downloading speed of just 10Kbps - 15Kbps on both time. And still i am getting speed of 2g instead of 3g. I am very much disappointed with this kind of service from BSNL. I request you to please solve my prob as soon as possible.