Try fax-ing an appeal letter to them. They either will or won't recheck it for you, not sure under which circumstances. Use the number in the MPM website.

I took the December 2010 MUET and scored 254, just 6 marks left for band 6. I appealed through fax and they replied a few weeks later stating that "the marks given were appropriate, there will be no changes to your score" or something like that. Some of my schoolmates that appealed managed to increase their scores though.

Our MUET results slip did state that "Any appeals would not be entertained", but a teacher told us to ignore that statement and assured us that MPM will recheck the results if you send or fax a formal letter to them, free of charge.

That was during the Dec 2010 MUET of course, they might have changed their policies this year.