Airtel — replacement 4g nano sim verification call failure

Address:

673310

I hav got a replacement airtel 4g sim fr my old microsim. As said i Sent new sim number to 121. Got a mesage and i sent 1 to proceed. It says it vl call shortly to confirm. And i got a call in 10 mins. But during the call... it doesnt recognise my choice of pressing 1 to approve. I hav bn trying fr 2 days with no use. I have no option or to change to jio. Getting vexed with airtel customer care. Worst.