Wobbly mattress

I bought a bed on the 19th of November 2022 called sleep comfort at Southgate Fair Price. The mattress was horrible. It felt like I am sleeping on soft stones. It had a wobbly effect. I went and reported the problem about two weeks ago. They said they will come and collect the mattress. Now it is xmas and I am still sleeping on this jumping castle. I will never make such a mistake. Next time I will stick the old trusted brands.