Matresses mady by Coricraft

I have purchased many items from Coricraft, and have been suly impressed, but, the mattresses is of suxh bad quality, they need replacement annually. I keep buying a more expensive mattress, but the springs break, and the mattress sags. They are very unwilling to assist, and veey conveniently state that the warranty is void if the mattress is "not clean". So a coffee stain influences the quality of the workmanship ? Shame on you Coricraft !