I purchased a Englander mattress because I thought it was...

I purchased a Englander mattress because I thought it was a good company .I informed the furniture store where I purchased this mattress 2 months after purchase that the mattress has body impressions that feel like you are sleeping in a hole . The salesman at the store says I have to send pictures of mattress to prove body impressions were more than 2 inches deep or the Englander company would not do anything .I sent pictures to prove the body impressions were 2 inches but was told by furniture store they would do nothing about this problem.