@members/thesaurabh/ congrats. See your thread title and contents.
im using glb-502t, everything was okay few days back
.. See few days could be two or twenty days ! Not specific.
You have not tried my suggestion to use another program ( see 4. post No 2 ). If you have reported failure, ( as this is like a proxy server, and by passes browsers ), someone or myself might have recommended AV/ antispy programs etc only. Usually the solutions work, without OS checking. And all do not have the original OS disk.
It is not possible to suggest some computer checking/tweaking, because poor MTNL and BSNL and their modem/s are to be blamed 99.99999% of the time!! What sketchy information users give in the post, here can only be used for suggestions. .
Any way your solution noted for future post/s.