Billdesk — Trying to pay property tax at kolkata municipality

Address:	700153
Website:	www.kmcgov.in/KMCPortal/KMCPortalPDPaymentAction.do

I am trying to pay the property tax on on kolkata municipality, from the past 3-4 weeks, while trying to pay the final button to pay, it calls billdesk portal and never returns the billdesk page,

The property tax payment for Kolkata Municipality, using below uRL.
https://www.kmcgov.in/KMCPortal/KMCPortalPDPaymentAction.do

Once, clicking the OK button, I am getting below error for past 3-4 weeks.

This site can’t be reached
www.billdesk.com took too long to respond.