my airtel speed has not increased.

I am costumer of airtel broadband from maybe 4 years(less or more) .I have increased airtel speed for one time and airtel has increased speed two times.what is needed is that i have swift 1099 +100. From 20 june 2011 news came of increased((four times in tier-1 and tier-2 cities) and doubled in other cities) speed.I got doubled speed for 2-1/2 months(not four times).Now i get same speed as i got before the news of 20 june 2011, not even doubled, I get earlier speed of 1mbps for 15GB and then 512 kbps.I think my FUP should be 100GB(or 1 or 2mbps unlimited ).I live in delhi.I have installed new router.thanks.