SMA DIVERTING TO LAND ON IFR FLT PLAN TOLD RADAR SVC TERMINATED SQUAWK 1200. LATER CONTACTED BY CTR FOR NOT CANCELING IFR FLT PLAN.

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I WAS ENRTE FROM SHEBOYGAN; WI. I REQUESTED A CLRNC TO VFR ON TOP FROM ROCKFORD APCH CTL AND WAS INSTRUCTED TO CLB TO 8000 FT. I WAS HANDED OFF TO CHICAGO CTR AND WAS CLRED TO 10000 FT. I WAS ON TOP AT 10000 FT AND WAS WORKED BY CHICAGO CTR AND THEN KANSAS CITY CTR. DUE TO A SUSPECTED FUEL LEAK I DECIDED TO LAND TO CHK OUT THE PROB. AT THIS POINT; I HAD BEEN HANDED OFF BY KANSAS CITY CTR TO CHAMPAIGN APCH CTL. I INFORMED CHAMPAIGN APCH THAT I WANTED TO LAND AT VANDALIA; IL (VLI). WE WERE IN OUR DSCNT AND AT ABOUT 3000-4000 FT AND N OF THE VANDALIA VOR; CHAMPAIGN APCH CTL TOLD US THAT 'RADAR SVCS TERMINATED; SQUAWK 1200; FREQ CHANGE APPROVED.' I UNDERSTOOD THIS AS A CANCELLATION OF MY IFR AND PROCEEDED TO LAND AT VANDALIA. UPON ARR AT OLIVE BRANCH; MS; I WAS TOLD TO CALL THE TWR. THE CTLR SAID THAT KANSAS CITY CTR HAD BEEN LOOKING FOR US AND THOUGHT THAT WE HAD GONE DOWN. IT WAS LATER DISCOVERED THAT THE CHAMPAIGN APCH HAD NOT CLOSED OUT OUR IFR WITH KANSAS CITY CTR. I THINK WHAT MAY HAVE HAPPENED WAS THAT POSSIBLY ONE CTLR WAS HANDLING ALL OPS AT CHAMPAIGN AND THAT HE WAS VERY BUSY AND OVERWORKED AND THIS HAPPENED TO SLIP BY HIM AS FAR AS CANCELLING US OUT WITH KANSAS CITY CTR.