Bought item not delivered and no refund made

I purchased an item using the website for Tenth Sports on 11 May, paid the amount, the delivery fee, and received a message that delivery would take up to 5 business days. After not hearing from them I emailed them on the email given on their website (on 17 May), and multiple times since then. While receiving an answer each time, the reason for the delay of the purchase keeps changing and I have yet to receive a delivery day nor a tracking number. The request to have my money refunded has also been ignored.