IKEA USA STOUGHTON Massachusetts New Sink Missing Parts, won't let me buy them stoughton, New Hampshire

I purchased a Odensvik Sink part#70180804 on 4/11/10 at Ikea in Stoughton MA. for a house we started building in May 2010.  We installed the sink (glued onto) an Ikea Vanity (attached to the wall) 7/1/10.  The plumber arrived on 7/12/10 to install it, he said it is missing parts/piping that CAN'T be purchased locally because of the odd size and configuration of this unit.  
I called Ikea and asked to buy the parts that are missing.  They said no, you missed the 90 day return policy by 4 days.  I don't want to return it, I just want to get the correct size piping to hook it up.  They said there's nothing they can do?   Are they serious? a brand new sink and I can't use it because of European piping sizes.  I will have to destroy the sink and possible the cabinet it is glued to, just to find another sink vanity to use. They are the worst customer service I have ever experienced.  I am Livid. I am NEVER buying another item from them and I am spreading the word NOT to purchase anything from them.