SIMILAR A/N CALL SIGNS ACR X RESPONDED TO WRONG CALL SIGN FLEW WRONG RADAR VECTOR HDG.

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ACR X DEPARTING CLE TO GSO. ATC HAD CLRED US DIRECT AKRON VOR. CTR; ABOUT 2 MINS LATER; CLRED US TO HOLD A 100 DEG HDG. ABOUT 5 MINS LATER; CTR ASKED US OUR HDG. WE TOLD THEM 100 DEGS JUST AS THEY ASSIGNED US. WE WERE THEN INFORMED THAT THEY HAD NOT GIVEN US THAT HDG; THAT THE CLRNC HAD BEEN FOR SOMEBODY ELSE. WE WERE THOROUGHLY CHASTISED AND GIVEN A CLRNC TO AIR VOR THEN CTR CORRECTED HIMSELF AND SAID 'NO; CLRED TO HVQ.' A FEW MINS LATER HE CLRED US TO PIT APCH AND WHEN WE QUESTIONED THAT CLRNC; AGAIN WE WERE CHASTISED FOR NOT LISTENING AGAIN. HE SAID THE CLRNC HAD BEEN FOR SOMEBODY ELSE. IF THE TAPES WERE TO BE PULLED I'M POSITIVE THEY WOULD SHOW THAT HE DID ISSUE THE CLRNC TO US EVEN THOUGH HE MEANT THEM FOR SOMEONE ELSE. ALSO; WE ACKNOWLEDGED THEM AND ON THE FIRST ONE; WAS NEVER CORRECTED UNTIL WE WERE ASKED OUR HDG 5 MINS LATER. OTHER CLRNCS LATER WERE GIVEN; ALT CHANGES; THAT WERE EQUALLY CONFUSING AND REQUIRED OUR ASKING FOR CLARIFICATION TO PRECLUDE ANY MORE MISTAKES. WHAT WAS HAPPENING HERE WAS CTR WAS HANDLING MULTIPLE FREQS AND WAS SIMPLY SATURATED TO THE POINT THAT HE DID NOT KNOW WHO HE WAS GIVING CLRNCS TO. AT THE LAST HE WAS LOOSING TRACK OF THINGS TO THE POINT THAT A TFC CONFLICT OF SOME KIND MUST HAVE ERUPTED BECAUSE HE GAVE US INSTRUCTIONS TO MAKE AN IMMEDIATE L TURN OF 30 DEGS. OUR TCASII NEVER ACTIVATED BUT APPARENTLY A POTENTIAL CONFLICT OF SOME KIND WAS IMMINENT.