Bharat Sanchar Nigam [BSNL] — low broadband speeds

I have got a new broadband connection of 20 mbps speed. Unfortunately, i have getting only 7 to 7.5 mbps speed. Upon contacting local exchange, they are saying they cannot provide more speed. The executives are rude in attending the calls and claim that i should be happy with the speeds i am getting.

If bsnl is marketing a plan of 20 mbps why should i get less than half of that?

Kindly provide me the speed as per the plan.

The registered complaints are being closed without attending or rectifying the issue.