Airtel — Broadband being hacked, stolen, siphoned

Address:	Bangalore, Karnataka, 560055
Website:	www.airtel.in

Since three weeks my broadband data is being stolen. have contacted airtel they made a few suggestions to add mac address of all items connected to wi-fi and change the password. i did all of that and still my data is being sabotaged. i do not know if it is a system wide issue with airtel. have been a long time customer of airtel. seems to me they are not really keen on resolving this issue.