Idea Cellular — Idea 3g speed not claiming right these days

Address:

Lucknow, Uttar Pradesh

I have been using idea 3g since 6 months and it was giving me adorable speed of 600-900kb/S(=7mbps), but had never expected it will give me this slow speed.
It is giving me speed of 10-25 kb/S(200-340kb/S) all day/Night, from last 10-14 days.

Please inform me why is my net-setter giving out this slow speed ? is there's any problem with idea's towers or my net-setter ?

my information :
name : abbas
netsetter (idea cellular number) number : [protected]
area : dargah
distric : rustum nagar
city : lucknow
state : up(east)
cell ID(s) : 28bb and sometimes 28bd
rssi (signal strengths) : -69 to -75 dbm (hspa)
network name : !dea
device using : e1732
Contact number : +91-[protected] (docomo)

heartly waiting for the response from idea cellular staff !

regards