You may need to cancel the event, not quiet the event.  Quieting an event is essentially acknowledging the event has occurred but telling the system to stop pestering you about that event again.  If the fault is resolved the system should put an end time to the event which is what an event cancel will do.  Only events that can have an end time can be cancelled.  When you cancel an event, you tell the system the fault is resolved.  If the fault still exists, the system should alert you again with a new event.

To get all the events including coalesced events type follwoing command:

isi events list -C -w