Bad customer service

I bought a voucher on 24/08/02, but cancelled it on 24/08/07. Their cancellation policy is 48 hours prior to you redeeming the voucher. Up to date, I have not received any feedback. They do not answer their phones and all my emails goes unanswered. Stupid me found another deal that appealed to me and I requested that they subtract the money for the new voucher and refund me the balance. Still no reply. I feel so foolish for trying to support a business that has no regard for their clients. I even recommended them to a friend, before I had my rude awakening.