Refund refused

I bought a Macbook Pro from Apple Dude in May this year. It was defective on arrival. I returned it and was told that they were waiting for a new hard drive. On more than one occasion I made arrangements for it to be returned to me when fixed. This never happened so I don't know if it has ever been fixed. Eventually I asked for a refund and was told that I will only get a refund if and when they sell the machine. I still have not been refunded. I would be careful of this company if I was you. It is ******* to refuse a refund. How can a company refuse to refund the money only if they sell the returned goods?