ACR X CLB THROUGH OCCUPIED ALT; TCASII RA CLB. HAD LTSS FROM ACR Y. SYS ERROR. EVASIVE ACTION TURN CLB.

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ACR X TO DEN DEPARTED ICT RWY 1R CLBING TO 15000 FT AND DIRECT TO THE ICT VOR TO JOIN J28. ACR Y INBOUND TO ICT THROUGH THE HUT ARR GATE AT 12000 FT; PLT'S DISCRETION TO 4000 FT. TFC WAS EXCHANGED TO BOTH ACFT AND ACR Y RPTED HAVING ACR X ON TCASII. BOTH ACFT WERE TCASII EQUIPPED. ACR Y WAS INSTRUCTED TO MAINTAIN 10500 FT; APPROX 6-8 MI NW OF ACR X; HDG WBOUND. THE MODE C OF ACR Y WAS LOST APPROX 2-3 SWEEPS ON RADAR; ARTS IIA; CST IN THE DATA BLOCK; THEN REGAINED. ACR X THEN WAS INSTRUCTED TO MAINTAIN PRESENT ALT. TO THE BEST OF MY KNOWLEDGE ACR X WAS 9300 FT CLBING AT THE MOMENT. ACR X APPEARED TO HAVE ACKNOWLEDGED MY XMISSION AT THE TIME; BUT CONTINUED TO CLB. I THEN INSTRUCTED ACR X TO CLB TO 11000 FT AND TO TURN TO A HDG OF 290 DEGS IN AN ATTEMPT TO PROVIDE LATERAL SEPARATION BTWN THE 2 ACFT. SUPPLEMENTAL INFO FROM ACN 226728: DEP CTL CLRED ACR X TO PROCEED DIRECT TO ICT VOR FPR J28 GCK; CLB TO AND MAINTAIN 15000 FT. PASSING APPROX 8000 FT WE NOTICED A TARGET ON TCASII AT OUR 12 O'CLOCK; DSNDING THROUGH APPROX 14000 FT. TARGET ACFT; ACR Y; WAS CLRED TO MAINTAIN 11000 FT. HE WAS EBOUND; WE WERE WBOUND AT EACH OTHER'S 12 O'CLOCK. WE RECEIVED A YELLOW TCASII ALERT AT THIS TIME. WITHIN A COUPLE OF SECONDS WE RECEIVED A RED ALERT AND A TCASII RA TO AVOID THE OTHER ACFT. AT THE SAME TIME THE ATC CTLR TOLD US TO 'MAINTAIN PRESENT ALT.' AT THIS TIME WE WERE AT APPROX 10500 FT CLBING. I MADE AN EFFORT TO LEVEL OFF BUT AT THE SAME TIME REALIZED THAT THE TCASII WAS TELLING ME TO CLB! AS I WAS STRUGGLING TO RESOLVE THIS CONFLICT. THE FO SIGHTED THE OTHER ACFT VISUALLY AND YELLED 'TURN R' AS HE GRABBED THE YOKE AND PUT THE ACFT INTO A SHARP R TURN. I THEN DECIDED TO FOLLOW THE TCASII COMMAND AND PULLED BACK ON THE YOKE TO CLB AS RAPIDLY AS POSSIBLE. AT THIS TIME I SIGHTED THE OTHER ACFT AT MY 11 O'CLOCK LOW POS PASSING TO MY 9 O'CLOCK. HE APPEARED TO BE ABOUT 500 FT VERTICALLY AND 1000 FT OR LESS HORIZLY FROM US. I QUESTIONED THE CTLR ABOUT THIS IN RATHER STRONG TERMS AND HE ACKNOWLEDGED THAT THERE HAD BEEN A MIX-UP! IN THE FUTURE; I WILL QUESTION THE CTLR SOONER WHEN I SEE A POTENTIAL CONFLICT ON TCASII. I HESITATE TO DO THIS BECAUSE NORMALLY IT IS EVIDENT THAT ACFT IN CLOSE PROX HAVE THE PROPER CLRNCS TO PROVIDE SEPARATION. ALSO; WE NORMALLY RECEIVE TA'S IN THESE TYPE OF SITS. SUPPLEMENTAL INFO FROM ACN 227382: THE CTLR TOLD US TO LEVEL OFF AT OUR PRESENT ALT. WE WERE AT APPROX 10500 FT AND CLBING. I SAW THE MLG EXIT A CLOUD. I GRABBED THE YOKE AND MADE A HARD R HAND CLBING TURN. WE FOLLOWED THE TCASII COMMAND. THE CAPT QUESTIONED THE CTLR AND IT APPEARED THE CTLR HAD MADE A MISTAKE.