Took my money and don't deliver

Placed a few orders with them and went smoothly. I then placed another order with them for goods that showed available on their website. Payment made via Payfast. 2 days later I received an email to say that what I ordered was out of stock but that they had an alternative but was more expensive. I paid the additional amount and that was the last I heard from them. Nothing has been delivered, they don't respond to emails, the phone number on their website says "subscriber not available". Do not recommend anyone to use this company. I will be opening a case against them at SAPS