Poor 3G data service(connection failure, disconnection, low speed)

Hello,
I’m using BSNL post paid service on mobile no. 9422293416. I recently have been activated a 3G data plan on my number. I’m using HTC Desire C(an android phone). Since the time of activation of this 3G service, i’m facing some problems like unable to connect to data service, sometimes it connects but it gets disconnected after few minutes each time and finally the horrible speed(lowest)…, etc!!!
I have complained many times to the customer care but yet the problem is not solved..!!!
The complaint docket numbers are 1G201483578 (on 20ty July), 1G251454329 (on 25th July), 1G271421524 (on 27th July), 1G271421524 and 1G291480951(on 29th July) Kindly solve my problem.. My details are : Mobile no. 9422293416, Alternate Mobile no. 9637749994, Email Address: [email protected] Thanks..