Airtel Prepaid — SIGNALS NOT REACHABLE

I'm sridhar Mob no:[protected],
I'll stay in lab's qrt's, near to SanthoshNagar,
Since my months I'm facing the signals problem near my residence location,
not only me, many of them who stay here are also with the same problem,
many times i called to 121.. the only answer i get that "it will be SOLVED in 15-20 DAYS"
BUT there is no solution..
many o[censored]s, changed their connections to TATA, RELIANCE or BSNL etc.
even i to shifted to BSNL prepaid..
even in small villages i travel their the signals will perfect in my mobile even though they are far from the city..