Airtel — unable to recharge prepaid number

I recently ported from postpaid to prepaid and i am unable to recharge my prepaid number through online modes such as paytm, airtel app etc.
I even visited airtel customer care centre where i ported my sim but they didnt provide any proper response.
My prepaid number is [protected].
I called customer care many times but no one is responding properly.
Have decided to port to some other network if this issue is not resolved asap.