Poor Service with Concerning Refund Issue

I recently purchased a product online with Manicaa.com. It said the product was in stock. The following day I received an email saying the item was not in stock and a refund would be issued within 7-14 days. It is now day 16 and I am still waiting. I haven't had a reply to 2 emails I've sent asking for reasons as to why the refund has not shown. Could someone PLEASE respond and pay me back? This is very concerning.