Ster-Kinekor unresponsive

Hi. I tried booking 6 x tickets for the Avenger's Endgame movie. I confirmed the transaction and then there was an error which said that the booking was unsuccessful yet the money was taken out from my account. Tried contacting Ster-Kinekor via phone and email with no response. Called my bank to make sure that the transaction went through which they confirmed and said that they are unable to reverse and that I should carry on calling Ster-Kinekor or wait for a response via email. I have been calling their customer care number with no response for hours. At this rate I won't get the seats as well as my money back. Just need some help.