Bharti Airtel — billing/data issue

Address:

Plot 61 near vasundara hospital moosapet, Hyderabad, Andhra Pradesh, 500018

This is mahesh uppuluri having airtel postpaid connection from last 4 months.. The postpaid number is [protected].
I facing data issue. I never connected to internet from last 4 months.. I gave complaint to airtel customer service and nodalofficer several times.. But they didn't respond.. I don't have data service and having 4g sim. They charged more than 500 monthly, they are not responding for my issue.. Please try to help me.. Thank you