No Service No Remedy

We made a purchase of 2 x double bed sets from Mattress King Stores on 20 December 2021 to the value of R 8000. 2 months later we noticed the mattress is sunken on both the beds, we made contact in March to the stores. After various attempts of mailing and making contact, we received feedback only in May 2022 asking for pics and commenting that this happen as we didnt turn the mattress. In June 2022, the store sent someone to check the beds, someone who gave incorrect feedback to the store. After many follow ups again i receive a call from one Keshnie advising that the beds will not be replaced or refunded because of a stain on the mattress. To date we have not received any feedback or confirmation on how this situation will be rectified and it is almost a year of purchase of the beds. My kids are sleeping on defective beds which caused them discomfort now for almost a year. This is absolutely unacceptable from a big store like this one. Service was great when we were buying the beds but no service or call or remedy to the situation is ridiculous.