SMA PLT RECEIVES SCT FREQ RUN-AROUND BEFORE CORRECT FREQ AND ISSUES RESOLVED.

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I WAS ON AN IFR FLT PLAN FROM SMO TO L65 (PERRIS VALLEY). SMO WAS 450 FT OVCST WITH TOPS AT 1200 FT. MY INITIAL ASSIGNED FREQ WAS 125.2. AT 1500 FT; I WAS TOLD TO CLB TO 5000 FT AND CONTACT SOCAL ON 128.75. I REPEATED THAT INFO BACK TO THE CTLR AND THEN WENT TO THE NEW FREQ. I CALLED THE NEW CTLR AT LEAST 5 TIMES AND RECEIVED NO RESPONSE FROM HIM. THERE WAS A GREAT DEAL OF OTHER TFC CONVERSING IN HIS SECTOR. TYPICALLY; WHEN FLYING THIS PROC; I HAVE BEEN TURNED TO A HDG OF 130 DEGS WHEN REACHING 2700 FT; AND NOW I WAS ALREADY AT 4900 FT. I SUSPECTED THAT I WAS GIVEN THE WRONG FREQ AND INDEED THAT WAS EXACTLY THE CASE. I CALLED BACK THE PREVIOUS CTLR ON 125.2 AND HE THEN ASKED ME WHERE I HAD BEEN. I RESPONDED THAT I HAD XFERRED FREQS PER HIS INSTRUCTION AND THAT I HAD CONFIRMED THAT TO HIM BEFORE CHANGING. I DECIDED TO CANCEL IFR AT THIS TIME; BUT FIRST I REQUESTED THAT I BE CLRED THROUGH OR AWAY FROM THE CLASS B AIRSPACE BEFORE CANCELING. I WAS CLRED TO CLB TO 5500 FT AND REMAIN ON THE SAME SQUAWK IDENT AND THEN TOLD TO CONTACT SOCAL ON 124.6. THIS CTLR TOLD ME TO REMAIN CLR OF THE CLASS B AIRSPACE. I TOLD HIM THAT THE ALT AND HDG WERE WHAT I WAS ASSIGNED BY THE PREVIOUS CTLR HE GAVE ME A NEW HDG TO FLY AND THEN ASSIGNED ME TO THE PREVIOUS CTLR'S FREQ OF 125.2. THIS SEEMED ODD. I VERIFIED THE NEW NUMBERS BEFORE CHANGING TO THEM. I WAS ONCE AGAIN UNABLE TO MAKE CONTACT. AFTER A FEW MINS OF FLYING; I CONTACTED THE FREQ I BELIEVED TO BE CORRECT (FROM MY RECALL OF PREVIOUS FLTS). I DID GET A RESPONSE FROM THE NEXT CTLR. HE DETERMINED THAT I HAD BEEN GIVEN AN INCORRECT FREQ AND SHOULD BE WITH HIM. I WAS THEN ABLE TO COMPLETE MY 70 MI JOURNEY. IF I HAD BEEN UNFAMILIAR WITH THIS SECTION OF LOS ANGELES AIRSPACE; THE DYSFUNCTIONAL CTLR'S ACTIONS AND INACTIONS COULD HAVE BEEN DISASTROUS. LUCKILY; I WAS 'ON TOP' IN VFR CONDITIONS DURING THESE MISFORTUNES.