Atrocious Customer Service

I went to the prestige in Sandton on 01/07/2018. I had a very disappointing experience. I was told that I would get a voucher as a refund for my ticket. It has been close to a month and I still have not received anything. I emailed Ster-Kinekor customer service on 02/07/2018 and I did not receive any response. I called the customer service 3 times since and each time I was told that I would receive my voucher by COB the following day. I received an email last week from Ster-Kinekor saying that my issue has been escalated but nothing since then. All I want is the voucher that I was promised but it feels as if I will never get it because I am constantly receiving empty promises or no response at all.