I'm Furious at Airtel

What the hell is going on? I recharged for a year on the minimal pack which has about 24gb data and unlimited calls. I only usedata when I am outside and there's no Vi coverage since I have wifi at home. So to be frugal, went for the annual pack, and whenever I run out of data, I buy the data pack of 15gb which has a validity of "current pack plan". Now they have fucking changed it 30 days validity. So what now?!! 1 have spend 181 every MONTH which adds upto 2.1k additional Man these companies really want to loot us and we are helpless. l am seriously considering going to BSNL/MTNL now. Any idea how to overcome this issue or using BSNL/MTNL is worth it? Does it have good coverage.