Lousy warranty

My wife and I purchase this bed because of the salesman's comments on it and initial tryout was comfortable plus he stated that it had a non prorated warranty. After 6 years the bed created to soft spots one on the right and one on the left with the center remaining hard. It was like sleeping in a cocoon. I called the sales store and they set up an appointment for the bed to be evaluated. The representative from Sleeptek's came to our home in Feb 2012 placed a string from corner to corner on both side and then a plastic glass in the center of the bed. (wow! a plastic glass) their letter came a few days later stating. 1. No manufacturing defects identified, 2 normal body impressions with in guidelines. 3. Comfort and or firmness are a matter of personal preference at the time of purchase. 4. Complaint unfounded. Well a plastic glass does not sleep on the bed we do and this is the worst mattress I have ever owned and I do not recommend it to anyone. The store where we purchased the set from was very helpful but the Manufatures rep was not, this mattress should not have broken down in that short period of time