Airtel — Payment made but not reflecting in broadband account

I have made payment for airtel broadband on 7th may, 2020 for a sum of rs. 589/-. This amount did not get reflected in the account and they disconnected my services.in spite of repeated calls, they did not restore my services even with proof of payment.

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As internet is vital to continue working, i made a payment in cash on 4th june to restore my services on the assurance of customer care that they will refund the original amount of rs.589/-.

Requesting help to please get this amount refunded.