Paid 3 times for an order

I ordered a tablet (in Australia) from <Removed> on the 17th May.  At check out I used my Amex, they told me to try another card.  Thinking I may have made an error in entering the information, I used it again.  Again they told me to use another card, which I did.

For the third time, I was told to use another card.

When I checked my Amex and other credit card transactions, I found that transaction there 3 times!!!!  I cancelled the order when I was told for a 3rd time to try another card.  Now I have paid 3 times for a product I don't have.

I contacted them with absolutely no joy at this time.

Contacted Paypal who said if Chinatera don't respond this week, they will refund my money.