MD88 EXPERIENCED CONFLICT AT FL230 AS CTLR ERRED AND CLBED RPTR'S ACFT THROUGH OCCUPIED ALT.

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ACTION TAKEN: ATC DIRECTED LEVELOFF PRIOR TO INITIALLY ASSIGNED ALT. DESCRIPTION OF EVENTS: DURING CLBOUT DEPARTING CHS FOR ATL; AN OPERROR OCCURRED WITH ZJX. WE WERE LEVEL AT FL230 AND GIVEN A FREQ CHANGE TO THE HIGH ALT SECTOR. FOLLOWING THE FREQ CHANGE; WE HEARD JAX FINISHING A COM WITH ANOTHER ACFT. THE CAPT THEN CONTACTED JAX WITH OUR ALT OF FL230. ZJX THEN RESPONDED WITH 'ACR CLB AND MAINTAIN FL300.' THE CAPT THEN CALLED BACK WITH A CLR CONFIRMATION. DURING THE CLB; WE RECEIVED A TA BTWN FL230-FL250. JAX THEN CALLED US AND TOLD US THAT THE CLRNC TO FL300 WAS FOR ANOTHER ACFT AND THAT WE WERE TO LEVEL AT FL230. THEN HE NOTICED THAT WE WERE ALREADY ABOVE THE TFC AND TOLD US TO LEVEL AT FL250. ANOTHER CTLR CAME ON AND TOLD US THAT WE MAY HAVE BEEN INVOLVED IN AN OPERROR AND GAVE US A PHONE NUMBER TO CALL. THE REST OF THE FLT WAS UNEVENTFUL. UPON LNDG IN ATL; THE CAPT CALLED JAX AND WAS NOTIFIED BY THE WATCH SUPVR THAT WE 'HAD NO FURTHER INVOLVEMENT IN THE INCIDENT.' THE CAPT CALLED 2 HRS LATER AND SPOKE WITH ANOTHER MGR WHO EXPLAINED THAT THE MISTAKE RESTED SOLELY WITH THE ZJX CTLR. HE VERIFIED THAT THE TAPES CLRLY SHOWED THAT THE CTLR CLRED US TO FL300.