Buy grocery online are THIEVES and refuse to refund for an order not delivered

Do not order from them ever. I ordered some items that they advertised they had stock of. The following day the lady called me and said there is no stock so I said then give me a refund. It is over 3 weeks now and I still have not received my refund for order #5533. I even gave them my bank details to process the refund but still no response from them.