Product quality very disappointing.

We bought a brand new Restonic matrass back in January 2019 and this matrass was sold with a 10 year warranty. The matrass sagged on both sides severely and this matrass is just a little over 2 years old. I reported this to the local supplier and Restonic and I was told that the bed carry a 2 year guarantee and an 10 year warranty and due to this fact that the bed is out of its 2 year guarantee I am must pay a portion to have the matrass replaced. I repeatedly stated that I am not going to pay this and even contacted the western cape regional manager who just referred me back to the warranty policy. I am shocked that my matrass has failed so early and so severely and that the manufactures only throws their hands up in the air. To be honest I am to afraid to pay the portion and get a new matrass as my confidence in the product integrity is so low that I feel the new matrass will probably also fail in 2 years. Now that I know how Restonic operates and have experienced the lack of quality in their product I am disappointed that I did not go with the more trusted brands available.