I have paid the amount for UP NEET UG Counselling for mop up round 2020, payment status is success from my side and amount got deducted but at other side it;s saying Pay registration Fees again. What to do?

Wait for atleast 24 hours after payment is done. Check the details correctly and see that you have paid fee for correct application. Maybe the server is not responding due to network issue.. Even after 24 hours the payment is showing as not done, mail to the official website of the particular examination about the issue you are facing. They will help you out with the solution for the problem for are having.