F900 CREW WAS ACCUSED OF AN ALTDEV AFTER 2 CTLRS DID NOT CATCH A READBACK ERROR.

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LOCATION: BHB. TIME OF DAY: XA00. FLT CONDITIONS: VMC. DAY PRIOR TO TKOF FROM BHB; A RTE CHANGE CLRNC WAS ISSUED AT THE END OF THE RWY. I READ BACK THAT WE WERE CLRED TO 17000 FT. ATC DID NOT CORRECT THIS. AFTER TKOF; I RPTED AIRBORNE PASSING 2000 FT CLBING TO 17000 FT; AGAIN ATC ACKNOWLEDGED WITHOUT CORRECTION. AFTER PASSING 11000 FT; ATC CALLED STATING THAT WE WERE CLRED ONLY TO 10000 FT. WE THEN DSNDED TO 10000 FT AND ATC ASKED THAT WE CALL THEM TO DISCUSS THIS ISSUE. TALKING TO THE SUPVR AT BANGOR APCH HE STATED THAT MY CLRNC WAS TO THE 10000 FT AND THAT THE CTLR DID NOT CATCH THE READBACK ERROR. THE SUPVR ALSO STATED THAT THE CTLR DID NOT CATCH ERROR ON THE AFTER-TKOF CALL STATING A CLB OF 17000 FT. THE SUPVR ALSO STATED THAT THE CTLR ISSUING THE 10000 FT CLRNC; MY READBACK OF 17000 FT AS WELL AS THE AFTER-TKOF CALL CLBING TO 17000 FT IS ON THE ATC TAPE RECORDING. THE SUPVR STATED THAT HE WAS SUBMITTING A OPDEV RPT BUT WAS NOT SURE THAT I COULD HAVE DONE TO PREVENT THIS THING FROM HAPPENING AGAIN AND HE ACKNOWLEDGED THE CTLRS NOT CORRECTING THE ERROR ON 2 SEPARATE OCCASIONS. THE OTHER PLT RECEIVED THE ORIGINAL CLRNC BUT WAS ON THE OTHER RADIO WHEN ATC ISSUED THE REVISED CLRNC. WE REPROGRAMMED THE NAV EQUIP AND DISCUSSED THE ALT DIFFERENCE; BUT DIDN'T THINK IT WAS UNUSUAL. THINKING BACK; AN ALT CHANGE IS SLIGHTLY UNUSUAL AND GREATER CARE SHOULD BE USED TO ENSURE CORRECTNESS. THE OPPORTUNITY TO CORRECT THIS PROB WAS IN THE CTLR'S HANDS BY LISTENING TO THE READBACK. ATC SHOULD NOT ISSUE REVISED CLRNCS AT THE END OF THE RWY. USUALLY THESE CHANGES ARE MINOR AND ONLY ADD CONFUSION TO A HIGH WORKLOAD ENVIRONMENT. THE CREW HAS TO REPROGRAM THE FMS THE ALT ALERTERS AND REBRIEF. THEY ALSO HAVE TO LOOK UP NEW ROUTING ON CHARTS WHICH ENCOURAGES TAKING SHORT CUTS.