B737 FLC TAKE ANOTHER COMPANY'S CLRNC; ADDING TO A COMPLEX TFC SIT.

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SHORTLY AFTER TKOF (DEP CTL) CONGESTION ON THE FREQ ALONG WITH SIMILAR CALL SIGNS COMPANY XYY (US) AND COMPANY YXY. CTLR AND COPLT WERE QUITE BUSY WITH A MIX-UP BTWN DEP CTL AND COPLT WITH CALL SIGNS AND CLRNCS. CTLR SEEMED OVERLOADED (ANXIETY IN VOICE). COPLT READ BACK CLRNC; THE CTLR ACKNOWLEDGED. WE WENT FROM 6000 FT TO 14000 FT DIRECT TO DIXIE INTXN. HOWEVER; WE DECIDED TO VERIFY WITH THE CTLR'S WORKLOAD AND ANXIETY EVEN THOUGH CTLR ACKNOWLEDGED. THERE WAS SO MUCH GOING ON WE COULDN'T BREAK IN FOR 60 SECONDS. WHEN WE VERIFIED; IT WAS UNDERSTOOD BY THE CTLR THAT ONE OF US OR NONE OF US MADE A MISTAKE. MORE SIMPLIFIED PROCS AND MORE CTLRS WOULD MINIMIZE THESE PROBS AT CRUCIAL TIMES ON THE FLT DECK; AND RELIEVE THE CONSTANT CHANGE OF THE SIT FOR THE CTLRS. ALSO; WRITTEN CLRNC IN THE BOX WOULD CLR UP SPD MISUNDERSTANDINGS. SUPPLEMENTAL INFO FROM ACN 458768: THE CTLR TOLD US I HAD TAKEN THE WRONG CLB CLRNC; WHICH WAS INTENDED FOR COMPANY YXY HVY. CAPT ASKED IF CTLR STILL WANTED DIRECT CDL; AND CTLR REPLIED NEGATIVE. I THEN ASKED IF WE SHOULD BE DIRECT DIXIE AND WAS TOLD YES. CAPT ASKED IF THERE WERE ANY PROBS AND CTLR SAID THERE WAS NOT.