S80 CREW RECEIVED CONFUSING INSTRUCTIONS FROM GND CTL AFTER LNDG AT LGA.

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UNSAFE RWY OP AT LGA. XA02Z; 121.85; LGA GND. DURING LNDG ROLLOUT; WAS PROMPTED BY TWR TO EXIT RWY NONSTANDARD TO THE R BY MARINE AIR TERMINAL AND CONTACT GND ON 121.85. UNABLE TO BREAK IN ON GND FREQ. GND SOMEHOW THOUGHT WE WERE ANOTHER ACFT THAT WAS AHEAD IN A LINE-UP OF DEP TFC. A CONFUSING DIALOG ENSUED. WHEN WE WERE FINALLY ABLE TO BREAK IN AND HELP OUT; WE INFORMED GND OF OUR 10 MIN GATE HOLD. WE WERE PARKED ON TXWY CC SHORT OF TXWY G. AFTER ADVISING GND THAT WAS OPEN; WE STILL SAT 15 MINS BEFORE MOVING. WE WERE THEN TOLD TO DOUBLE BACK ON TXWY BB AND HOLD SHORT OF RWY 22 AT TXWY E. UPON TURNING ONTO TXWY E; I HEARD GND CLR ANOTHER ACFT AT TXWY G TO CROSS RWY 22. AS WE WERE ROLLING; I EXPECTED LIKE CLRNC TO CROSS RWY 22. NOT RECEIVING CLRNC; I STOPPED THE ACFT PRIOR TO XING THE HOLD SHORT LINE. THE LNDG ACFT LANDED. GND THEN INSTRUCTED US TO EXPEDITE ACROSS RWY 22. WE READ BACK. I APPLIED PWR AND STARTED MOVING ACROSS RWY 22. I ESTIMATE NEARLY THE ENTIRE ACFT WAS ACROSS THE HOLD SHORT LINE WHEN GND; IN A PANIC; INSTRUCTED ME TO CANCEL XING CLRNC AND HOLD SHORT. I STOPPED AND INFORMED GND THAT WE WERE WELL PAST THE HOLD SHORT AND IN AN UNSAFE POS WITH ACFT ABOUT TO LAND -- LESS THAN 1/2 MI. GND INSTRUCTED TO CONTINUE ACROSS AND TAXI TO RAMP. ACFT ON FINAL WENT AROUND. I WAS TOO UPSET TO EVEN CALL THE TWR AND DISCUSS THE DISMAL HANDLING I EXPERIENCED FROM ROLLOUT TO PARKING.