Poor quality beds

I bought a sealy picanto from sleepmasters on the 27th of November 2024 and within week the bed started sagging on both sides and swollen right in the middle of bed and made funny sounds. I logged a complaint with sleepmasters and they took for ever to acknowledge the complaint. On the 2nd of January 2025 the mattress was replaced. Within a couple of days after receiving the exchange it did exactly the same thing the previous one was doing. On Monday 6th of Jan 2025 i logged another complaint with sleepmasters and was given a reference number SM-Seal-***. I called sealy this morning to follow up with the complaint but to my surprise they had nothing on their side from sleepmasters. The complaint has not even been acknowledge by the store. This is so frustrating.