well this was to be expected. We already told this situation repeatedly on EK threads that went crazy over airtel.
Airtel's data bandwidth is bought from lankacom and it has a limit. Looks like they've reached that limit pretty fast.
I had a airtel connection, in Feb… it was disconnecting every 2 hours and etc and so much other issues, I demanded them to disconnect it.. and still they wanted to keep it active so stupid, they suck real time.. please take your connection and go away