Airtel — failed recharge through paytm

Address: Ghaziabad, Uttar Pradesh, 201206

I ported my number from bsnl to airtel few years back.
After porting all things were going right.
But now after porting i am unable to recharge my number using any of the reputed platforms like paytm, phonepe, including airtel official site
I, hereby request you to please resolve this problem asap

Before may 2016 it was all ok but since after may i am facing this problems

Thank you
Siddharth malviya