Airtel Broadband — faking internet connection and looting consumers money

sir
with due respect i want to acknowledge u the fact that airtel comes out everytime with a new plan to loot the innocent consumers.
i got a broadband connection on this number [protected] and with internet speed of 256 kbps.
Account No: 14101492

the rental plan was for 799 a month respectively and unlimited download.
i use the connection only for internet purpose and not for phone call so the charge was suppose to come within 900 rs inclusive of all taxes but they would charge me unwantedly foe dsl usage which is totally fake because i dont even have a reciever to make a call and they would add up many other charges without any reasons and make up my bill about 1100 every month.
then due to my financial problem i didnt make one payment for which they cut my line.
when in the mean time i didnt have any connection they charged me 700 rs without even have having a connection.
when i complained them about it they gave me a big discount without any reason and told me to change my plan from 799 to 549 they told me that the internet speed would be the same and they would also give me 100 rs worth phone calls free in every month.
so i switched my plan but now i saw that this plan is totally fake, my internet connection is no longer having the speed which it used to have while i was using the 799 plan.
even the download speed is totally useless of about 1-5 kbps.
i am a poor and helpless student in delhi, i came from assam but this airtel seems to suck up my money and i dont have any elder who can talk to the airtel consumer care about this problem so i am depending on u to take care of my problem
PLEASE HELP ME.