Clearing the confusion
You paid the ECFMG to extend your eligibility period (not to reschedule).
You have to pay Prometric to reschedule, because you wanted to change your date less than 30 days before the scheduled date which is 22nd March, today is February 28th so it's less than a month.
You paid the ECFMG to extend your eligibility period (not to reschedule).
You have to pay Prometric to reschedule, because you wanted to change your date less than 30 days before the scheduled date which is 22nd March, today is February 28th so it's less than a month.