SEALY! NEVER AGAIN! DISGUSTED

I have purchased a mattress in 2018 from the Mattress King, a Sealy Cortez King XL. I had paid R24000 for this mattress. After one year, we had noticed how this mattress has started to sink on the sides that we sleep on slightly but continued rotating this mattress. We had now raised the mattress issue with Sealy and we are told that we need to pay an extra R6000 to get a replacement. I am disgusted!!!! I invested so much so that i can get a good quality mattress, now Seally has the nerve to demand R 6000- so in total, i need to pay out R30000 for this mattress. I am terribly disappointed in this mattress and the company, i wanted to invest in a Simmons, but the Sales consultant advised me to rather go for Sealy. I am so sorely disappointed