Simmons - Argento mattress

We purchased a Simmons Argento King mattress in August 2016. The Dial-a-Bed salesman specifically checked that we wanted an ultra-firm mattress (which we did).

Within months, it had inexplicably collapsed on my side of the bed (I only weight 56kg). Simmons sent inspectors, who confirmed the box springs had collapsed - and they replaced the mattress. A few months later, the mattress had collapsed again. We kept hopefully turning it as per salesman's instructions every three months but eventually 9 months later - rinse and repeat. Now, for the third time, we are in the same situation except both Dial-a-Bed and Simmons are not stepping forward to do the correct thing: upgrade to a mattress which is more structurally integral. Instead I am being told that it is normal body impressions and must turn the mattress every month. This is not going to do Simmons or Dial-a-Bed's reputations any good.

So much for a top of the range mattress.... I really feel cheated.

I think my 25 year old Sealy was still firmer after all those years than a three month old Argento ultra-firm.