CHARTER PLT WITH EMPTY ACFT MISHEARS ALT ASSIGNMENT; QUERIES APCH CTLR AND IS GIVEN AN AFFIRMATIVE RESPONSE.

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DEPARTED ADRIAN; MI; ARPT VFR AROUND 1500 FT MSL. 2 MI FROM ADRIAN ARPT I CONTACTED TOLEDO APCH AND REQUESTED MY IFR FROM ADRIAN; MI; TO MILES; MI. TOLEDO APCH GAVE ME AN IFR CLRNC WHICH WAS (I THOUGHT) CLRED TO 3TR VIA DIRECT GJJ DIRECT MAINTAIN 5000 FT MSL. I READ IT BACK. CLBING THROUGH 4500 FT MSL I CHKED THAT 5000 FT MSL WAS STILL MY ALT (I FILED 6000 FT). TOLEDO APCH CONFIRMED. ABOUT 15-20 MI FROM ADRIAN; MI; I CHKED I WAS STILL SUPPOSED TO BE WITH TOLEDO APCH; WHICH HE SAID YES. A MIN LATER I ASKED IF HE STILL WANTED ME AT 5000 FT MSL. TOLEDO SAID HE HAD GIVEN ME 6000 FT INITIALLY AND TO CLB TO 6000 FT MSL. I RESPONDED CLB TO 6000 FT MSL WITHOUT QUESTIONING THE ERROR. THE CTLR THEN BEGAN RUNNING A TEST ON THE RECORDER FOR THE FREQ. A FEW MINS LATER TOLEDO APCH CALLED AND SWITCHED ME TO KALAMAZOO APCH. I CALLED KALAMAZOO APCH AND TOLD THEM I WAS LEVEL 6000 FT. KALAMAZOO SAID THEY HAD NOTHING ON ME; MY FLT PLAN WAS GONE. I GAVE THEM MY ACFT PREFIX PA31 AND DEST 3TR. I AM NOT SURE I DID ANYTHING WRONG OTHER THAN NOT HEARING 6000 FT MSL AS MY ALT. I AM 90 PERCENT SURE I'M RIGHT. IF NOT; BETTER COM BTWN CTLR AND PLT IS NEEDED! I WAS AT 5000 FT MSL FOR 15- 20 MI WHEN TOLEDO THOUGHT I WAS AT 6000 FT.