Company refuses to refund money for non delivery of goods

Bought and paid for an aircon 29 December. Received no notification. Asked for a refund and was told manager will look into it. I sent proof of payment and a person named Leezel told me the money was received and I can request a refund which I will receive in 5-7 working days. I keep on getting the runaround or simply no response to my queries. Can anyone please advise me how to get my money back from these useless people. I am at my wits end. Please don't waste your hard earned money on such ***** people.