my retirement check

I APPLIED FOR MY RETIREMENT IN OCTOBER 2008. I TO TODAYS DATE OF JANUARY 21, 2009 HAVE NOT RECEIVED A CORRECT AMOUNT FOR ANY MONTH. I WAS ALSO TOLD BY AN AGENT THAT THEY FELT MY AMOUNT PER MONTH WAS CALCULATED WRONG ON THE SAME DAY, SAME PERSON THAT ISSUED AN OVERPAMENT I HAVE SPENT HOURS AND HOURS ON HOLD OVER AND OVER BEGGING FOR SOMEONE TO GET MY AMOUNT AND TIME OF CHECKS STRAIGHTENED OUT FOR GOOD. I HAVE BEEN VERY PATIENT, MY SOCIAL SECURITY CHECK IS ALL I HAVE TO LIVE ON. I HAVE SAT AT MY LOCAL OFFICE FOR 2HOURS AND AGAIN ASSURED IT WAS ALL OK, AGAIN I GET A LETTER YESTERDAY STATING I WILL GET $346 ON THE 3RD WED. NOTHING ELSE. I AM SOOOOO ANGRY AND FRUSTRATED I DON'T KNOW WERE TO TURN. TO ADD TO EXTREME ANGER I HAVE BEEN ON HOLD FOR 20 MIN FOR THE 3RD TIME TODAY AND JUST GOT CUT OFF.