Seal Mattrass - no Turn but sagging

We purchased a Sealy Bolton Firm mattress in November 2014 from House & Home in Edenvale. At first it was extremely comfortable and we were very satisfied. In January we noticed that the mattress shows indents on the sides where we sleep. My side worse than my husband and I weigh less than him.<br> <br> we reported this and an inspection was done at home and they measured a 2 cm sag on the mattress and reported back that we need to rotate the mattress every 2 weeks and if the sagging becomes 4 cm in 3 months time - then they will look at replacing it.<br> <br> The mattress is not comfortable any more and we have a bulge in the centre of the bed - so it feels that we are sleeping in a hollow ...<br> <br> I am very disappointed because I thought that if we buy a Sealy rather than an unknown brand - then we would not have problems - but this is just not acceptable. Mattresses are not cheap as it is an investments for years to come and after 3 months we are already experiencing discomfort.<br> <br> my previous mattress which we had for 12 years did not sag until the last year.<br> <br> The service from House & Home has been excellent, but Sealy did not resolve this to my satisfaction at all!!!