ACR ISSUED CLB TO 7000 FT WHEN CHANGED TO DEP FREQ. TAKES EVASIVE ACTION WHEN TCASII TA INDICATES TFC AND CTLR CALLS TFC AT SAME ALT.

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DEPARTED RWY 01. SWITCHED AS ASSIGNED TO WORK DEP ON 126.6; ASSIGNED HDG AND CLB TO 7000 FT; ALSO; GIVEN TFC AT 7000 OPPOSITE DIRECTION XYZ AIRLINER. AT ABOUT THE SAME TIME THE CTLR CALLED THE TFC AT 2 O'CLOCK DSNDING TO 7000. WE SPOTTED SUSPECT ACFT ON TCASII AT 10 O'CLOCK. XYZ TFC WAS ALSO ISSUED 2 O'CLOCK TFC (SUPPOSEDLY OUR ACFT) CLBING TO 6000. WELL; WE WOULD HAVE BEEN AT XZY'S 10 O'CLOCK AS WELL AND HAD JUST BEEN ASSIGNED 7000. A TFC ALERT WAS RECEIVED; THE CTLR SAID 'MLG MAINTAIN 6000' AS WE VERBALLY QUESTIONED OUR ASSIGNED ALT TO 6000; AS WOULD HAVE BEEN EXPECTED IF THE CTLR KNEW WHERE WE WERE. WHEN THE CTLR REALIZED THERE MAY BE AN ERROR/CONFLICT; HE ISSUED US A L TURN; WHICH WOULD HAVE AGGRAVATED THE SITUATION; AS TARGET ACFT WAS ON TCASII TA AT 10 O'CLOCK AND CLOSING. CAPT RAISED FLT SPOILERS; TURNED ABOUT 30 DEG R; AND WENT DOWN TO 6000. NO RA WAS PRESENT; BUT THANK GOD WE HAD TCASII; BECAUSE WITHOUT IT WE WOULD HAVE TURNED DIRECTLY INTO THE PATH OF THAT INBOUND; OPPOSITE DIRECTION AIRLINER.