ACR X UNAUTH CLB TO HIGHER ALT HAD LTSS FROM ACR Y. PLTDEV. SYS ERROR.

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ACR X REQUESTED CLB TO 370; AND WAS TOLD 'WE HAVE YOUR REQUEST; IT WILL BE AT LEAST 25 MI DUE TO ACR Y. ACR Y WAS 12 O'CLOCK AND 25 MI. ABOUT 3 MINS LATER ACR X WAS ISSUED A CLRNC TO 'TURN 15 DEGS L FOR HIGHER; MAINTAIN FL330; TFC IS 12 O'CLOCK AND 10 MI; EXPECT HIGHER AFTER PASSING.' THE PLTS READBACK WAS 'OK; 15 DEGS L AND CLB TO 370; ACR X.' THE 15 DEG L TURN WAS TO AVOID TFC AT 12 O'CLOCK AND 60 MI; WHICH WOULD HAVE ENABLED ACR X TO CLB AFTER THE FIRST TFC. CONFLICT ALERT ACTIVATED A FEW MOMENTS LATER WHICH ALERTED US TO THE SIT WHICH IS WHEN THE PLT WAS TOLD HE SHOULD BE AT 330; MAINTAIN 330. NO EVASIVE ACTION WAS TAKEN BY THE PLT. IMMEDIATELY FOLLOWING THE ACR X READBACK; WE ASKED ANOTHER PLT TO 'SAY AGAIN;' WHICH INDICATES WE WERE LOOKING ELSEWHERE; NOT EXPECTING ACR X'S INCORRECT READBACK. I BELIEVE THE MAJOR CONTRIBUTING FACTOR TO THIS IS THE LACK OF RESPONSIBILITY A PLT HAS FOR HEARING CLRNC CORRECTLY. IF THE PLTS WERE MADE TO BE AS RESPONSIBLE AS THE CTLRS; MORE PLTS WOULD NOT ACCEPT CLRNC FOR WHAT THEY WANT TO HEAR; BUT FOR WHAT WAS ACTUALLY SAID.