MTNL Delhi — false bill

Address:

South West Delhi, Delhi

sir my mtnl telephone number is 25060172. I have submitted the amout for a new connection on 28th of march 2013 and on 12th april the lineman came for setting up the connection.
After setting they left but still internet was not working so i complaint again and on tuesday that is 16 th of april they came and changed the modem.
but now i have got bill of 30th march to 15th april that is of 403 rupees.

and i have got a second bill from 16 april to 30 april of 379 rupees .
my plan was of 499 unlimited but company has cheated me and now it seems like bill of around 800 per month.

I want my money back from the company