You mean 25-27 kbps or KBps?
Remember if its 25-27 KB/s, it is 200-216 Kbps.
Anyway can you post the speed you get here, for better diagnosis:
http://speedtest.net/
If it's indeed as slow as 25-27kbps, I think first check whether a software or a service or virus has hogged the bandwidth. Use a Linux Live CD to determine the same.
If it is as slow then, I think there is problem in the lines and you have to contact MTNL.