Airtel — unable to recharge airtel number

Address:

Gautam Buddh Nagar, Uttar Pradesh, 201301

I am not able to recharge my airtel number ever since i switched from postpaid to prepaid service.
Upon customer care suggestion i have visited airtel stores, got sim swapped, yet the issue is not resolved.
I have tried recharging through mobile shops and myself via internet, airtel app, paytm. I have raised the issue to customer care over a dozen times but yet my issue is not resolved.

Do you ppl have any fix to this issue. I wonder why nobody from store or customer care is not able to figure out the cause of this!