Sad sagging 1 month old bed

I bought my 1st grown up bed in December 2022. It was delivered by the 10th of December. After about 2 weeks I noticed it is sagging. My heart is very sore,as I used my bonus to buy me and my husband our first new bed ever. It was an expensive bed and now it is just sagging getting worse weekly. I am very unhappy if I had read all the complaints I would definitely have thought about my purchase a little more. So sad to have this experience with my first grown up be