Airtel — no bill/receipt was given for sim upgrade charges

Address:

Airtel store, kkp road muktsar, Muktsar, Punjab, 152026

Hi team

I visited airtel store today for sim upgrade from 2g to 4g and they charged rupees 60 and did not give me any bill. On asking for bill they said airtel doesn’t give any bill for any charges.

Its law of govt of india to provide bill / receipt to any customer. Then how airtel can refuse to provide

Name: vicky mukhija
Number : [protected]