Wushof have lifetime warranty on things. Maybe send them back to them and see what happens.
http://www.wusthof.com/warranty-information-and-returns
Scale replacement is probably going to run more than a new knife. Material isn't cheap and a pretty fair amount of labor removing old, prepping, attaching new, and shaping.
Jim
What are you wanting them replaced with?
View attachment 1031419
Like spideyjg said it can be spendy but if you want a less expensive wood not too bad.