Extremely bad service

So I bought a bed with dial a bed midrand during their special the bed was set at R13999, a seally laundette, the bed came after 3 if not 4 weeks of purchase, the mattress is extremely firm nothing I felt inside the store, I am now told to upgrade for comfort for cheaper bed with retail price of R9k without the special of R9k its called seally strato plus,I am made to believe the bed is expensive than what I bought and that I must pay for only delivery of R400, I mean people think we are stupid out there, I asked them to return my money my R8k plus R750 costs of delivery and mattress protector and am still told its not possible, that bed might u I have never slept on it, its hurting my back,