Waiting since Feb. 2015 for refund

I booked two seats in advance on 6 February 2015 for a Sunday afternoon movie (an opera, which is more expensive than ordinary movies) via my credit card. Then load shedding happened and the movie was cancelled with no rescheduling. I immediately reported this on Ster-Kinekor's website and I got a reply that I will be refunded within 7 days. Nothing happened, so on 18 and 24 February, 23 March and 23 April I sent e-mails requesting the refund. Every time I got a reply with more excuses and promises that I would be refunded \within 7 days". (On my last request of 23 April i got no reply) To this day I haven't been refunded. I have all the e-mails regarding this. They owe me R79"