Delivery date changed for my goods due stock

I'm utterly disappointed with the treatment I got from your store in fourways. I bought the bed on Saturday and paid the deposit and I was told that if I paid the remaining amount before Wednesday I will get my bed on Saturday , I paid the balance before then only to be told that they can't deliver my bed on Saturday due to their trucks being full they will deliver the next week Saturday I don't care I want my bed this saturday or I get my money back. You breached the contract on the agreed delivery date and I won't be liable for cancellation fee either this is not my mess up . I'm upset with this , someone better fix this ASAP