AN A320 WAS DISPATCHED WITH SEAT ASSEMBLY XXDEF DEFERRED AS INOP PER THE MEL. SEAT WAS DEFERRED IMPROPERLY AS ONE TRACK BOLT WAS MISSING.

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DURING DEP; MAINT WAS WORKING AN INBOUND WRITE-UP OF 'SEATS AT XXDEF ROCK ALL 3 SEATS.' THE MECHS SHOWED UP ON THE ACFT AT APPROX XA30 TO BEGIN THE REPAIR. AFTER WORKING ON THE ISSUE PAST DEP TIME; MAINT DECIDED TO DEFER THE ITEM AND DEFERRED IT PER MEL; 'SEATS INOP; SEATS NOT TO BE OCCUPIED.' SEATS WERE PROPERLY TAPED AND PLACARDED AND PROPER RELEASE AND MEL WERE RECEIVED PRIOR TO PUSHBACK. AFTER ARRIVING IN ZZZ1; I WAS INFORMED BY THE ONCOMING CAPT THAT OUR DISPATCH WAS ILLEGAL DUE TO THE FACT THAT THE MEL WAS NOT CORRECT. THE SEATS WERE MISSING A FASTENING BOLT TO THE DECK OF THE CABIN; AND; THEREFORE; MUST HAVE BEEN FIXED OR REMOVED PRIOR TO FLT. FACTORS RELATING TO THIS INCIDENT INCLUDE THE FACT THAT MECHS WERE RUSHED DURING WORK ON ITEM; CONFUSION AT CTL CTR IN THAT THEY DID NOT INITIALLY KNOW WHY THE FLT BOARDING WAS STOPPED DURING THE WORK; AND THOUGHT OUR ACFT WAS INDEED A DIFFERENT ONE; FLT CREW WAS BEGINNING AN ALL-NIGHTER LEG AND PROPER REST IS ALWAYS A CHALLENGE PRIOR TO SUCH LET; FLT WAS EVENTUALLY PAST DEP TIME WHICH AGAIN PROMPTED MAINT TO BE IN A HURRY.