MD82 CREW HAD A CLRNC READBACK; HEARBACK ISSUE AS THEY TAXIED INTO POS AND HOLD AT ORD.

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WE WERE CLR TO TAXI TO RWY 22L VIA R TURN ON TXWY A; A18; AND TXWY D EXPECT RWY 22L FOR TKOF FROM THE GATE AT THE COMPANY RAMP AT ORD. ONCE WE WERE ON TXWY D WE WERE INSTRUCTED TO CHANGE TO TWR FREQ. TWR CTL GAVE US THE FOLLOWING INSTRUCTIONS 'ACR X GO THROUGH THE RWY 27L PAD INTO POS AND HOLD.' INSTEAD OF FOLLOWING TXWY D ALL THE WAY TO RWY 22L; I READ BACK; 'INTO POS AND HOLD RWY 22L ACR X.' HE CORRECTED ME BY SAYING; 'GO THROUGH THE RWY 27L PAD.' NEVER SAID HOLD SHORT OF RWY 22L. AS WE WERE GETTING CLOSE TO INTO POS ON RWY 22L; TWR INSTRUCTED TO 'HOLD POS.' IN THE NEXT 30 SECONDS WE WERE CLR TO TAKE OFF RWY 22L. I READ BACK 'CLR FOR TKOF RWY 22L ACR X; AND WE HAVE A QUESTION IF YOU HAVE THE TIME.' HE SAID; 'GO AHEAD ACR X.' 'SIR WE WERE CLR TO GO INTO POS AND HOLD RWY 22L BEFORE?' HE ANSWERED; 'NO YOU WERE TOLD TO HOLD SHORT OF RWY 22L.' THE ONLY PART OF THE CLRNC THAT I MISSED WAS TO READ BACK 'GOING THROUGH THE RWY 27L PAD; WHICH HE CORRECTED ME WHEN I READ BACK THE TAXI INSTRUCTIONS. THE CAPT AND MYSELF NEVER HEARD TO HOLD SHORT ON RWY 22L.