@Home terrible after sales service and *****s

I purchased mattress from @Home the Glen, I was assured it's one of their elite beds and would last along time. Now 6 months later I have sent back the 2nd mattress yes 2 in 6 months. I don't want another mattress as the quality is terrible now I get told the only refund method is by the way I paid. This is ok however I paid up my account in its entirety now I have a balance of which I bought clothing for so in any event the bed is paid up! I'm sick of not getting feedback and just overall bad service I want my money back I want cash deposited into my account as now I have to go buy another bed from somewhere else. To add injury to the insult I don't have a bed as they collected their mattress and now I'm left with nothing. Can someone sort this out for me asap for such a big chain store you carry on like regular *****s. I paid off the mattress I submitted proof of payment so don't come and tell me you can only refund the method of which the item was purchased.