QVC and Serta review: serta mattress 1

I bought a serta matress in 2014 2015 and I have springs digging in my back. I contacted qvc they told me to contact serta. I did serta wanted to charge me to have it inspected after me complaing about the fee the said they would waive the fee and sent me a copy of their 10 warranty which states if you matress has even a little stain the warranty is voided. So I did not even bother having it inspected right. So im stuck with this matress that is causing back pain. And neck pain and headaches do to the ddefected workman ship of the manufacturer. why have a 10yr warranty if you dont plan on doing so.