Airtel — regarding airtel 399 recharge

Address:

500089

Recharged with 399 on 29-aug-17 as 84gb data valid for 84days from 14-sep-2017 as my previous recharge valid till 14-sep but upon checking by validity it is showing nov-6 as end date which is 70 days from 29-aug. Upon calling customer care who is very rude telling that my number don't have that offer and he is not ready to provide his supervisor number. His name is hari who said supervisor airtel's customer support. May i know the process to whom i can contact to get my money back or to get valid response from airtel?
— ramakrishna