If u call after 24hrs. From wrong deduction (later came to know means) they never return. Just they will tell system reset now so can't give it back blah blah
Had one experience like this same like what sumit bro faced today
It happened with me i was downloading something on pc through mobile hotspot and suddenly i noticed that my main acoount balance became 0 and data was still remaining .But i didn't call cc thinking that nothing would happen .Will keep in mind next time as airtel will do fraud again some other day