Samsung Washing Machine — Replace part

We purchased samsung fully automatic top loading washing machine in 2006 October. In last december due to some reason the IC in the top operation panel is spoiled.Even the customer care has no idea the reason for that. When called the samsung customer care initially they told the part will be replaced, and after 2 months finally they said that manufacturing of that part is stopped. Now they said they can only give the depreciation cost up to 55%(not sure how much they come finally) once we give back the existing machine.

I dont understand how come after just 3 years they stop manufacturing the parts. What happens if the parts are spoiled by some unavoidable circumstances. Is the life of the samsung product just 3 years? what action should i take inorder to get proper justice.

Thanks