indentations on the mattress. pitches to edge. squeaky.

at first it was fine. then, when i or hubby got up, it started making noises - squeaky. then, i noticed that it would pitch us toward the edge of the bed and if we tried to turn over, it was almost impossible. my hip pain has gotten way worse and this past week i found an indentation on the mattress. i have a very hard time falling asleep and staying asleep on this mattress. i noticed that the sides of the mattress are thinner than they were. there is no way this mattress will even last 5 yrs. i feel we got taken. i realize we didn't pay a lot, but this is just garbage. we had an heirloom for over 20 yrs, but could not afford a brand like that today. still, a mattress around 3 yrs old, even an inexpensive one, should be better than this one is.