PLT OF SMA ACFT OVERSHOT MISSED APCH ALT DUE TO PREVIOUS PRACTICE APCH ATC ALT ASSIGNMENTS.

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ON THE ABOVE SAID DATE I WAS PRACTICING APCHS AT VERO BEACH IN VFR CONDITIONS. I HAD COMPLETED 2 VOR RWY 11R APCHS EXECUTING PUBLISHED MISSED APCH PROCS. IN BOTH CASES; AFTER RADAR CONTACT WITH ZMA; I WAS INSTRUCTED TO CLB AND MAINTAIN 3000 FT. THIS IS A NOTED 1000 FT INCREASE AS COMPARED TO THE PUBLISHED ALT OF 2000 FT. AT THE COMPLETION OF MY THIRD VOR 11R APCH I BEGAN EXECUTING THE PUBLISHED MISSED APCH ON A HDG OF 360 DEGS. AT AN ALT OF 700 FT I CONTACTED ZMA AND ADVISED THEM THAT I WAS EXECUTING MISSED APCH. AT THIS POINT; I THOUGHT THAT ZMA CLRED ME TO CLB AND MAINTAIN 3000 FT AND I CONTINUED MY CLB ON THE SAME HDG. AT 2400 FT ZMA ASKED ME TO ADVISE THEM OF MY ALT AND I TOLD THEM THAT I WAS AT 2500 FT. THEY THEN ADVISED ME TO DSND AND MAINTAIN 2000 FT AND THAT THERE WAS IFR TFC AT MY 1 O'CLOCK; 2 MI; WBOUND. AT THE SAME TIME; THEY ASKED ME WHY I WAS AT 2500 FT AND I TOLD THEM THAT I WAS CLRED BY THEM TO CLB AND MAINTAIN 3000 FT. FURTHER THEY ASKED ME TO READ THE PUBLISHED MISSED APCH INSTRUCTIONS AND I RESPONDED. IMMEDIATELY AFTER I WAS TOLD TO DSND; I COMMENCED THE DSCNT PROC. UPON LEVELING AT 2000 FT; I RESPONDED LEVEL AT 2000 FT AND THAT I HAD THE TFC IN SIGHT. SOON AFTER; I CANCELLED MY IFR FLT PLAN TO RETURN UNDER VFR CONDITIONS TO VERO BEACH. THIS WHOLE INCIDENT IS BASED UPON MY UNDERSTANDING THAT I WAS CLRED TO CLB AND MAINTAIN 3000 FT. THE SUPVR TOLD ME (AFTER I CALLED ZMA AS I WAS INSTRUCTED AFTER I CANCELLED IFR) AFTER LISTENING TO THE PLAYBACK THAT THE ONLY RESPONSE OF THE CTLR AFTER MY ADVISORY THAT I WAS EXECUTING A MISSED APCH WAS 'ROGER' AND THAT THEY THOUGHT THAT I WOULD CLB AND MAINTAIN 2000 FT. THE CONTRIBUTING FACTOR TO THIS ENTIRE CASE WAS PROBABLY THE FACT THAT I WAS INFLUENCED BY THE PREVIOUS 2 MISSED APCH INSTRUCTIONS; THAT IS; CLB AND MAINTAIN 3000 FT.