Airtel — payment made but still they have disconnected my no.

I had paid my bill amounting ₹1300/- on 9th august, 2019 against mobile no. [protected] in name of adv. Vishal patade via internet banking. I have emailed at customer complain but no solution from there end. I have acquired a letter from airtel bank in which they agree that the transaction was successful which has also been shared by airtel but stil they are not connecting my no.