Poor quality kitchen unit

I bought a kitchen unit mid April this year(23 April 2021) on their online website and I am not happy at all with the quality of the kitchen unit. The back is coming off and what was used to assembly it wasn't strong or the wrong size which makes it hard to remain assembled. It's not up to 6 months and I am stuck with a bad quality kitchen unit that makes you see the wall when opening the doors of the unit. I don't understand why such a big company can be selling substandard goods. This is truly day light *******. Please people be aware at the goods you buy at Fair Price, it's truly not worth buying at that shop.