SPI WAS ACCUSED BY ATC OF NOT ADHERING TO INSTRUCTIONS WHEN TRANSITIONING AN ATA.

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DURING A LCL SOLO TRAINING FLT TO RAMONA (L39); I ASKED FOR TRANSITION THROUGH SEE'S ATA AT 1500 FT MSL NE BOUND. TWR REQUESTED; 'STANDBY;' SO I CIRCLED OUTSIDE THE ATA. THERE WAS A SIMILAR CALL SIGN ON FREQ (BOTH ACFT ENDING WITH SAME NUMBER). TWR DID NOT ADVISE OF SIMILAR CALL SIGN. WHEN HE CALLED BACK; HE THOUGHT I WAS AT 1700 FT AND I CORRECTED HIM. THE FREQ WAS VERY CONGESTED. EVENTUALLY; I WAS CLRED AT 1500 FT AND ADVISED THAT THERE WAS TFC IN PATTERN RWY 27L AND TO WATCH FOR TFC. I ACKNOWLEDGED WITH MY 'N' NUMBER. I DID NOT WANT TO OVERFLY THE DOWNWIND LEG OF PATTERN; SO WITH VISUAL CONTACT WITH AN ACFT DEPARTING RWY 28R. I STAYED W OF THE FIELD HDG NE UNTIL I INTERCEPTED A ROAD N OF SEE. I FOLLOWED THE ROAD TO A HWY THAT TRAVELS E AND THEN TURNS N IN ORDER TO STAY CLR OF TCA. WHEN I WAS JUST NE OF FIELD (SEE) I HEARD TWR ADVISE OF A TWIN ENTERING FOR R BASE RWY 28R THAT THERE WAS AN ACFT W OF HIS POS AT 1500 FT (MY ACFT). ABOUT 1 MIN LATER I SAW A TWIN AHEAD AND HIGHER (ABOUT 200 FT). I DSNDED AND TURNED R. THE TWIN ADVISED TWR THAT HE HAD JUST CROSSED PATHS WITH ANOTHER ACFT. TWR THEN ASKED 'ACFT NUMBER; SAY POS;' AND I REPLIED; '3 MI S OF SAN VICENTE RESERVOIR.' SEE TWR THEN TOLD ME TO TAKE DOWN THEIR PHONE NUMBER AND TO CALL THEM UPON LNDG. I REQUESTED A 180 DEG TURN TO TRANSITION BACK TO MYF AT 1800 FT. I WAS CLRED AS REQUESTED. ON THE GND; I PHONED AND THE TWR SAID I FAILED TO COMPLY WITH INSTRUCTIONS TO STAY W OF THE FIELD DUE TO TFC IN PATTERN RWY 27L. HE SAYS HE NEVER MADE VISUAL CONTACT WITH ME; AND HIS STATEMENT WAS THAT I WAS 3/4 OF A MI NE OF SEE WHEN THE TWIN AND I FLEW NEAR EACH OTHER. HE DID NOT CALL THE TWIN OUT TO ME BECAUSE HE DID NOT KNOW FOR SURE THAT I WAS THE ACFT HE WAS LOOKING AT. I BELIEVE THAT THE TWR CONFUSED THE 2 ACFT ENDING WITH SAME NUMBER. HE DID NOT ADDRESS ME AS RPTR ACFT NUMBER NOR DID HE WARN OF OTHER ACFT OF SIMILAR SIGN. IN FUTURE; IF ATA CLRNC WAS REQUIRED TO BE REPEATED; THE POTENTIAL FOR MISUNDERSTANDING SHOULD BE REDUCED. THE TWR SHOULD MAKE A STRONGER ATTEMPT TO MAKE VISUAL CONTACT WITH ACFT TRANSITIONING THE ATA. ADDITIONALLY; BOTH PLTS NEEDED TO BE LOOKING OUT FOR TFC. (ESPECIALLY ACFT THAT HAVE RECEIVED A TFC RPT).