Very low actual speeds in 2 Mbps plan

[jimmy]

Hey friends,

Last month i upgraded to 2 mbps broadband plan.

To confirm the actual download speeds i use various speed meter sites and softwares....on one of the sites which i regularly use....connection speed of around 1600 kbps was shown and download rate achieved was always higher than 200 kbps from almost all sites initially for few days...but after that all bandwidth meters show my conn. speed in the range of 300~ 700 kbps (or rarely a max of 800 kbps) and downloads rate from popular/common sites comes to be around 20 ~ 70 kbps (many times on the lower side)
I have contacted airtel support so many times but no solution has come up the airtel bandwidth meter always shows speed higher than 2 Mbps

If someone has 2 Mbps plan, pls tell what kind of speeds do you generally get, i can give the addr of the sites and speed meters that i use just to cross check...

Pls help me...