A B727 FLC HAS A CLOSE CALL WITH A B757 TYPE THAT HAD A 'VISUAL' ON THEM BUT CAME TOO CLOSE FOR COMFORT W OF ATL; GA.

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WHILE CLBING TO 14000 FT; TURNING TO 270 DEG HDG; HEARD ATC ADVISE ACFT #2 OF OUR POS. I NOTED HIS POS AT APPROX 5 O'CLOCK POS; ABOUT 2 MI; CLBING ON THE TCASII. I LOOKED OVER MY L SHOULDER TO LOCATE ACFT #2 AND SAW HIM ON A CONVERGING HEADING. OUR TCASII GAVE RA TO DSND AT MORE THAN 2500 FPM AND I TURNED WINGS LEVEL; DSNDED; AND THEN TURNED TO THE R. ACFT #2; SILL CLAIMING HE HAD US IN SIGHT ABRUPTLY TURNED L; BELLY UP TO US. THIS AGGRESSIVE MANEUVERING WAS NECESSARY TO AVOID US. WE KEPT HIM IN SIGHT ENTIRE TIME; FOLLOWED TCASII GUIDANCE; BUT FEEL THAT OUR TURN AWAY FROM THE TFC WAS NECESSARY TO AVOID CONTACT. IF HE INDEED HAD US IN SIGHT; HE WAS SLOW TO AVOID US. OUR ACFT WAS NEVER NOTIFIED OF THAT TFC UNTIL AFTER WE QUERIED THE CTLR AFTER AVOIDING THE CONFLICT. I BELIEVE THAT THE CONFLICT WAS CAUSED BY THE CTLR VECTORING ACFT #2 INAPPROPRIATELY WITHOUT ALT SEPARATION; AND BY ACFT #2 NOT 'SEEING AND AVOIDING' OUR ACFT. SUPPLEMENTAL INFO FROM ACN 450365: WE WERE IMC. DEP HAD GIVEN THIS ACFT; A B757; WHICH TOOK OFF IMMEDIATELY AFTER US; AN EARLIER 360 DEG WX AVOIDANCE VECTOR AND PUT HIM INSIDE OUR FLT PATH. ALSO; HIS CLB PERFORMANCE WAS BETTER THAN OURS. SO WITH THIS APPARENT; THE CTLR ASKED THE B757 IF HE HAD US VISUALLY. HE REPLIED AFFIRMATIVE. THROUGHOUT THE ENTIRE RADIO EXCHANGE THE B757 CONTINUED ON A COLLISION COURSE. WHEN WE CAME OUT OF THE CLOUDS WE SAW THE B757 AT 1 MI CLOSING. HE AND THE CTLR HAD THEIR RADIO EXCHANGE AND THE CTLR ASSURED US HE HAD US IN SIGHT AND WOULD MAINTAIN VISUAL SEPARATION. ONLY HE DIDN'T. HE TURNED BELLY UP ON THE COLLISION COURSE AND WE PULLED THE PWR TO IDLE; PUSHED OVER AND PULLED TO THE N TO AVOID A COLLISION. HE CROSSED OUR FLT PATH DIRECTLY OVER THE TOP OF OUR B727 AT APPROX 100-200 FT ABOVE US. I TOLD THE CTLR TO SAVE THE TAPES AND HIS SUPVR IS INVESTIGATING.