corner piece has broken frame

This five piece leather sectional was purchased at Macy's in October 2007; when we complained to Macy's about the broken frame after two years, we were told it was not their responsibility and we should contact the manufacturer Chateau d'Ax since the frame has a lifetime guarantee; have written three letters to them with no reply whatsoever.  The retail price at Macy's was $4,000.; please do not make the mistake we made; do not buy furniture from Macy's-they do not stand by their merchandise, nor buy this brand of furniture;it's a piece of junk.
P.S.  HAVE NO PETS OR KIDS THAT COULD HAVE DAMAGED THE FURNITURE.