CREW OF B757 MAY HAVE TAKEN ANOTHER FLT'S CLRNC AND DSNDED TO FL330 FROM FL360 IN ZMA AIRSPACE.

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AFTER DEPARTING MIA WE RECEIVED VECTORS WELL S TO AVOID TSTMS. WITH ZMA WE RECEIVED A CLRNC TO CLB TO FL300 AND TO EXPEDITE CLB. WE COMPLIED. WE LATER RECEIVED A CLRNC TO EXPEDITE CLB TO OUR FINAL CRUISE ALT OF FL360. AS WE WERE CLBING TO FL360 THE CTLR ADVISED THE FREQ THAT MIA AND FLL WERE BOTH CLOSED TO ARRS DUE TO TSTMS AND BECAME VERY BUSY WITH HOLDING CLRNCS. WHEN WE ARRIVED AT FL360 WE WERE GIVEN A DSCNT TO FL330. THE CAPT READ BACK THE CLRNC AND ASKED TO CONFIRM IT AS IT WAS UNUSUAL. THE CTLR CONFIRMED THE CLRNC. THE CAPT READ BACK THE CLRNC AND COMMENTED 'SURE GLAD WE HURRIED TO FL360.' THE CTLR SAID SAY AGAIN. RATHER THAN REPEAT THE COMMENT THE CAPT READ BACK THE DSCNT CLRNC AGAIN AND I BEGAN THE DSCNT. UPON REACHING FL330 WE WERE GIVEN A CLRNC TO CLB TO FL360. THE CAPT READ BACK THE CLRNC TO FL360 AND ASKED WHAT THE DSCNT HAD BEEN FOR. THE CTLR SAID THAT WE MUST HAVE TAKEN SOMEONE ELSE'S CLRNC. THERE WERE NO TFC ISSUES. THE CAPT AND I BOTH HEARD THE CLRNCS AND ALL OF THEM WERE ACKNOWLEDGED.