The mattress king beds

I bought 2 beds from mattress king in Springfield park..taking the advice of a salesman in the stores I purchased a double n single bed..both carrying gaurantees on them ..it as been a year I've got the bed sinking..metal sticking out of the bed,from all sides.I called The mattress king they then sent a accessor to have a look at the bed..and the feedback was I should buy another bed..for more than the value of my current one n pay they difference!!! Y should I? When the quality of this bed is not up to after par!! They are selling poor quality beds to customers!! People should be aware of the quality of beds sold at the mattress king!!! Absolutely putrid!!!!