Chemical Smell

I am very disappointed that the mattress has loss it's support and I only had it for 3yrs. But, mainly the mattress emits this really strong chemical smell. It is unbearable and doesn't smell healthy. I purchased it from Mattress Firm and the only response I get from them is that this is the first time it last this long and the warranty doesn't include chemical. But suggested that I placed coffee beans on top of the mattress or an apple. I would like a replacement for the inconvenience. This is awful.