Airtel — first recharge failed multiple times after porting to airtel prepaid

Address: 2nd Floor G-231 G block, Vikaspuri, New Delhi, Delhi, 110018

I have ported my airtel postpaid number to prepaid on the assurance of their customer care representative that it will be seamless and to enable prepaid services i just need to do a first time recharge of 298 rupees. Once the call disconnected i got the message that my sim is converted to prepaid but when i tried recharging the sim it has failed 3 times. The money is being deducted but the services are not getting activated.