B737-300 CAPT DESCRIBES PUSHBACK INCIDENT FROM CONTRACT CREW THAT WAS NOT IN COMPLIANCE WITH HIS COMPANY SOP.

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RAMPERS WERE RUNNING LATE GETTING THE BAGS LOADED. RIGHT AT THE SCHEDULED DEP TIME; THE PUSHER CAME UP AND SAID 'RELEASE THE BRAKES!' I RESPONDED THAT THIS WAS NOT THE SOP AND I HAD A RADIO CALL TO MAKE TO GET PUSH CLRNC. ONCE CLRED TO PUSH; I STATED 'CLRED TO PUSH BRAKES SET.' THE PUSHER; WITHOUT RESPONSE; STARTED TO PUSH THE ACFT WITH THE BRAKES SET. WHEN THE PLANE DIDN'T MOVE; HE ASKED ME IF I HAD RELEASED THE BRAKES YET. I ASKED HIM WAS HE FAMILIAR WITH AIRLINE PUSHBACK SOP'S. HE SAID YES; SO I AGAIN SAID 'CLRED TO PUSH BRAKES SET.' HE AGAIN TRIED TO PUSH US BACK WITH SET BRAKES. I ASKED FOR A DIFFERENT SOP COMPLIANT PUSHER. A NEW PERSON TOOK OVER AND WE PUSHED BACK AS EXPECTED. AFTER PUSH COMPLETE; THE BRAKES WERE SET; THE CREW RECEIVED DISCONNECT PERMISSION. THEY DISCONNECTED; SHOWED US THE NOSE GEAR PIN AND WALKED OFF WITHOUT ANY SALUTE OR RELEASE FROM GUIDANCE. I KNOW THESE ARE FOREIGN AIRLINE PEOPLE AND THEY DON'T USE OUR SOP AT FOREIGN AIRLINE; BUT THIS WAS THE WORST I'VE EVER SEEN.