Memre pillows

I bought 2 memre foam pillows many years ago. I wanted to replace them because the covers don't look so nice anymore, so I bought 2 more online from Makro on 26 April 2024. When I received it first of all it was smaller than the ones I bought years ago and much much harder then my first ones. I gave it to my 2 young children to sleep on because I thought maby it will get softer but it is now 4 months later and just as hard as it was 4 month ago. This is not what I expected when I bought this pillows.