Airtel — mobile data and wi fi networks not provided as per plans and interrupted and unfairly charging for isd calls and sms

AIRTEL provides interrupted network and charges for ISD CALLS and SMS saying that calls were not done through internet but directly -our mobile data is on always and wi fi is present most of the time and calls are made through internet but they claim that they were made directly-this shows they are withdrawing network amidst calls and trying to profit by charging as direct calls -I had complained about it several times but they don’t agree and argue-some lady Ekkaiya argued unnecessarily and refused to credit back the charges made in the bills -she did not acknowledge her network deficiencies but blamed us for those calls .Kindly be strict with such network providers -today also I can see that have increased the data limit under the broadband plans but they fail to provide data as promised -we need to complain almost everyday and besides if wi fi and mobile data services are interrupted then how can the calls be controlled ?