SELLING DUD BEDS

I bought a bed in May last year for my son, he didn't even use it for a month and then the mattress worn out in the middle of the bed. Reported it to the shop in November, after a lot of struggle I was told that the factory that made the mattress I bought was sold and I must wait till middle January then they will exchange the mattress. Beginning February I asked again what was happening. Now there is no guarantee on the bed only warrantee and I must pay to get the mattress fixed. DO NOT DO ANY BUSSINESS WITH THEM.