Never a good night sleep

I purchased my mattress from a local retailer that did not have a 30 day guarantee if we didn't like the mattress (first mistake). The saleswoman told me that it would be great for people with back problems and neck problems so I decided to go with it. Unfortunately, this bed is so hard and so uncomfortable that my partner is literally refusing to sleep in this bed any longer. Ive had it for under a year now and would never recommend it to anyone! My hips have started hurting sleeping on it (I'm freaking 27 years old) but after paying $1000 for the damn thing, I don't want to buy a new bed already! Now we are searching for a mattress topper that will hopefully make it so we can actually sleep on it without feeling like we've been hit by a semi in the mornings...