Fukc airtel they did the same thing with me ..then i told them to disconnect the account as it is a dealbreaker they connected me to there Central team which then said they will enable bridge mode but wont allow any other options like changing LAN and DYNAMIC DNS (were also disabled from backend) so i decided to not recharge (they won't just accept closer of account) i could have bought a new router but then again i opt for another isp...so choose the later