Airtel — faulty information on recharge on app and recharge by fraud

I have airtel app on my cell and on that 399 plan as unlimited calls 84gb data. I clicked for seeing terms and conditions which they don't show and on clicking directly mpin was asked and on entering mpin my balance got recharge without showing t& c. I called up customer care who rudely tells me that its not unlimited calls but 3000 min for 28d. Y is it not mentioned in scheme on app & tc not shown when you click on it... This is fraud as the app should have mentioned details of the scheme and falsely on show it as unlimited... So disappointed and angry with airtel