Less than 100 days old and already sinkholes?

Hello,

I am writing because I am very dissatisfied with my mattress. The mattress is less than 100 days old and already gets sink holes and is causing deep painful mornings with aching back and joints. There is no support below the comfort layers. When I roll over it already takes way too long to come back up. How is a 3 month old mattress already comparable to a 10 year old mattress??? This was every penny I had plus borrowing money to afford it. I am broke and in back pain and honestly devastated.