Not good enough - please pay back my money

I had placed an order for an item that had ‘stock available’. The payment went through. I then got an email saying the the item was out of stock and I would receive a full refund within 7-14 days. This has not happened and I would like my money back. I have tried using the ‘chat’ To communicate. No answer. Have sent numerous emails to ***. No replies. I have tried calling. The numbers message box is full. What to do next? This is unacceptable. I also placed a second order for another item so I hope I do receive it! Not good enough Manicaa - please reimburse money.