Airtel — mislead

It says "you have insufficient balance to make an outgoing call". I have recharged with Rs.399/- on 22/10/2017, the offer claimed my all calls will be free with daily 1gb data and it will be valid for 70 days. Today while having a conversation suddenly the call dropped.
Its so cumbersome to get connected with the customer executive, press that press this and at end you get nothing. Kindly resolve at the earliest.