Enps — registration against this acknowledgement id is pending for confirmation from payment gateway. please try again after sometime. error

Hello,

My acknowledge number is : 11307751
Acknowledgement Date: 03/01/2021

I am constantly getting the below error while trying to complete registration process.
"Registration against this Acknowledgement Id is pending for confirmation from payment Gateway.Please try again after sometime."
I request you to please resolve this asap. I am pissed off seeing this error constantly.