Ster Kinekor - Where is my Refund?

I booked movie tickets online for Avengers End game on Tuesday 2 April 2019. Money went off my account but never received the tickets. Contacted Ster Kinekor the next day and was notified that their system crashed and that everyone who tried to purchase tickets would be refunded. I then emailed Ster Kinekor but got no reply, sent them tweets, got no reply and was told on Thursday 11 April 2019 that the money would be in my account by no later than 48 hours time when I called the call centre again. Today, its 16 April 2019 and I am still yet to receive my refund. I use to be a loyal Ster Kinekor customer but I'll rather move to Nu Metro if this is the level of service we now receive!!!