WHILE MAKING IFR APCH TO VRB ARPT; PLT; ACFT X; SPOTS VFR TFC; ACFT Y; AHEAD ON BASE LEG. CTLR SEQUENCES ACFT X #2 TO FOLLOW ACFT Y.

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AT 8 DME WE CALLED VRB TWR RPTING TFC; ACFT #2; A PA28; AT OUR 10 O'CLOCK POS; ON L BASE FOR RWY 29L. VRB TWR ASKED THE TFC ON THE L BASE FOR A POS RPT. OTHER ACFT CAME ON THE FREQ MAKING THEIR CALLS STEPPING ON THE COM. BY NOW WE WERE ABOUT 2 NM ON FINAL AND ON A COLLISION COURSE WITH THE TFC ON BASE. THE TWR TOLD US THAT WE WERE #2 BEHIND THE PA28 ON BASE AND TO RPT FINAL. I STATED THAT I WAS UNABLE TO MAINTAIN SEPARATION AND THAT WE WERE ALREADY ON FINAL (THE VOR DME RWY 29L FINAL APCH COURSE IS ALIGNED WITH THE RWY). AT THIS POINT; NOT GIVEN AN AMENDED CLRNC; I INITIATED A R 360 DEG TURN TO AVOID THE TFC; STATING MY ACTION ON THE FREQ. THE TWR CAME ON SAYING THAT MY TURN WAS NOT AUTH AND THAT I WAS STILL ON AN IFR FLT PLAN. I CANCELED IFR IMMEDIATELY AS I WAS TURNING TO AVOID THE PA28. OTHER ACFT STEPPED ON MY CALL; OPS ON THE PARALLEL RWY 29R WERE ON COURSE AND I HAD TFC IN SIGHT ON THE R BASE. WHEN I FINALLY CALLED AGAIN REJOINING FINAL AND CONFIRMING MY IFR CANCELLATION; THE TWR CTLR STATED THAT IT WAS TOO LATE FOR CANCELING IFR. HE THEN CLRED ME TO LAND SAYING TO CALL THE TWR ON THE TELEPHONE FOR A POSSIBLE PLTDEV. THE LNDG WAS UNEVENTFUL; EXCEPT FOR THE TWR CTLR GETTING ANGRY OVER THE RADIO WITH AN ACFT CALLING FROM OUTSIDE CLASS D. HE SAID; 'I'LL CALL YOU; DON'T CALL ME AGAIN; STAY CLR OF CLASS D; I HAVE 10 ACFT IN THE PATTERN.'