Double deduction from credit card

On 27 April I bought two tickets online. After entering payment I got no order reference. I phoned Ticketline and spoke to Lee who assured me there is no booking and definately no payment will be deducted so I can go ahead and book again. I did this. when I picked up my tickets only one set of tickets were issued. However on 9 May two deductions were made on my credit card.

I then phoned Ticketline again and was told to email the detail through and they will credit it within 7 days. I got a case number within a couple of minutes but that is where it stopped. It is now nearly a month later and I am still waiting for a refund.

On 2018/05/22 I phoned and spoke to Hoeford who said he will follow up and get back to me. Nothing happened.

On 2018/05/25 I phoned and spoke Mesham who promised by latest Tuesday 29 May I will have a refund. He also promised his supervisor will phone me which did not happen.

On 2018/05/30 I phoned and spoke to Bridget who promise by the end of the week (1 June). Also she will phone me. Neither of these promises happened.

On 2018/05/31 I received an email from Luleka Sithole asking for a statement three days after the transactions went through. I immediately sent this of and got absolutely no reply. I then asked again on the 5 June what the status of the refund is. Absolutely no reply.

On 2018/06/06 I phone and spoke to Warrick. He started on the same story that "they cannot trace the money on their side" and I have to send a statement for two months which is completely ridiculous as the transaction only happened a month ago. I then demanded to speak to his supervisor. He refused to transfer me to the supervisor and kept putting me on hold. When I complained about he cost the promised if put the phone down he will phone me back immediately when I put the phone down. I am still waiting.

So the question is how do you get your money from Ster Kinekor?