Unfair treatment

On 22/05/2014 I bought couches and returned them because they were not in good condition. I was forced to take something else of the same value because they don't want to give back the money. A gas stove is an option but there must be a refund because the stove is cheaper. Again they want to take the stove that is on the display for the same price. They are not giving back the money because they say the supplier doesn't want to take back the couches. Is that how it should be? Should I not get my money back?