So finally got access to my data usage, and sure enough 17th morning between 01:16:26am and 02:00:54am we have supposedly consumed 57.88GB in downloaded data and 9.25GB data in uploaded data in the span of 44 minutes and 18 seconds!! This translates to a download transfer of 463040 Megabits in 2658 seconds which is a download speed of 174.2 Mbps, and an upload transfer of 74,000 Megabits in 2658 seconds which means an upload speed of 27.84 Mbps. Needless to say, this is practically impossible on our plan which is 8 Mbps download and 512 Kbps upload. To put it in other number, to consume that kind of data it would have taken 17 hours 15 minutes and 48 seconds (download) and 44 Hours 8 Minutes 33 Seconds (upload) - certainly not 44 minutes.
Have sent e-mails to 121, appellate authority, TRAI etc. Let's see what happens. Meanwhile we have been FUPed and I have to bear 512Kbps.