SMT RECEIVED A FAULTY AND CONFUSING TAXI CLRNC FROM ONE CTLR; ANOTHER CTLR CORRECTED THE CLRNC. THE PLT WAS UNABLE TO TALK TO A SUPVR.

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TAXIING FOR DEP TO RWY 15 FROM FBO AVIATION AT DCA THE GND CTLR ASKED IF WE COULD USE RWY 18 AT 'H' INTXN -- 3500 FT REMAINING. WE SAID WE COULD DO THAT. WE WERE THEN INSTRUCTED TO TAXI TO RWY 18 AT 'HOTEL' AND HOLD SHORT. TWR THEN INSTRUCTED AN MLG INTO POS RWY 18 AND HOLD. THE TWR CTLR THEN INSTRUCTED US TO TAXI INTO POS RWY '15' AND HOLD. MY COPLT READ BACK THE CLRNC TO THE TWR AND RECONFIRMED RWY 15. THE COPLT AND I LOOKED AT EACH OTHER AND RECONFIRMED THAT THE CTLR SAID RWY 15. (RWY '15' IS ADJACENT TO RWY 18 AT THIS LOCATION). UPON REACHING '15' WE NOTICED THERE WAS ONLY 1000 FT OF RWY REMAINING. AT THE SAME TIME THE TWR CTLR ASKED US WHERE WE ARE GOING. OUR RESPONSE WAS YOU CLRED US TO RWY '15'. HIS RESPONSE WAS 'UNBELIEVABLE -- CONTINUE TAXI TO RWY 21 HOLD SHORT IN THE BLOCK.' AT THIS POINT ANOTHER CTLR CAME ON AND CLRED US FOR TKOF RWY '21.' UPON RETURNING TO OUR HOME BASE 35 MINS LATER; I IMMEDIATELY CALLED DCA TWR TO FIND OUT WHERE THE MISTAKE WAS MADE. I WAS ROUTED THROUGH SEVERAL PEOPLE AND EVENTUALLY PUT ON HOLD. FINALLY SOMEONE CAME ON THE LINE AND SAID 'THERE IS NOBODY UP THERE; CALL BACK NEXT WK.' I CALLED AGAIN ON XX AND WAS INFORMED I NEEDED TO TALK TO QUALITY ASSURANCE HOWEVER HE IS OUT OF THE OFFICE. HE WILL BE RETURNING MOMENTARILY AND WILL RETURN YOUR CALL WITHIN THE HR. AS OF THIS RPT I HAVE BEEN UNABLE TO TALK TO ANYBODY AT DCA TWR ABOUT THIS INCIDENT.