NPS — Unable to complete transaction

Address: Mumbai

Website: enps.nsdl.com/eNPS/NationalPensionSystem.html

I was in the process of registering for NPS Account updating my details and uploaded the required documents.

Then i tried to make payment but got stuck at payment gateway.
Now am trying to complete registration using my Acknowledgement ID and date, but i am getting the error that-
Registration against this acknowledgement id is pending for confirmation from payment gateway. Please try again after sometime.