Things don't happen overnight, when ringgit falls it still takes time for countries to make decision & negotiate the purchase, also they want to see if the fall is temporary or long term, at the moment Ringgit is fluctuating, last week up, this week down so it doesn't help boosting export unless it's a quick ebay purchase.

If you looked at your currency exchage chart you'd notice Ringgit is actually still high which resulted in reduced exports for the past year, recent fall on rm merely brings it back to normal.

those agencies usually rate based on their own agendas.

for example if the finance minister says rm gonna rise, everybody will believe him & start buy rm.

2007 is a good example how rating companies screw everyone up.