Online order mishap and billing issues

Ordered online the 2 Oct (13 items ordered) for delivery the 3 Oct Order No o ********** 45. Paid using my Credit Card. Received a phone call the morning of the 3 Oct to tell me that all 13 items I ordered were out of stock. They then cancelled my order and told me my Credit Card amount would be refunded. This has still not been done. The amount is still on hold at Woolworths. Then ordered again later the day on the 3 Oct (22 items) for delivery the afternoon of the 4 Oct (today) Order No o ********** 04 and just received another phone call from Woolworths telling me that 13 of the items I ordered is not in stock. How does their online shopping work? The stock was available when I ordered and paid for it and now there is nothing? To make matters worse I cannot get hold of Woolworths. Have sent several emails to 2 different Woolworths adresses and messages on the Facebook Online chat. Even left a complaint on their FB Wall. But NOTHING. No response or any feedback. Worried I will not get my money back or well be charged for items I never received. Very disappointed in the customer service. One expects better service from them.