Airtel — worst data and network issue

Address:	Anantapur, Andhra Pradesh, 515001
Website:	WWW.AIRTEL.IN

I have purchased iphone 7 with airtel postpaid plan with 1 child plan in november, 2017 and from the day 3 i was facing iam getting only 2g internet and calls were dropped frequently. I have complaining about the issue from dec, 2017 to till date. I have tried everything airtel customer care team, backend network team and nearby airtel store persons told to do. But till date no one solved problem/issue faced by me. Iam unnecessarily asked to pay the postpaid bills without proper usage of data/calls. The customer care persons have requested to "please pay the bills for this time next time the problem wont arise" but no use they have been softly betrayed me for 8 months. Please help me legally against airtel for the suffering caused by them mentally.