Ignoring Refunds

SAA has been avoiding for three months to refund me. They keep on referring me to different departments and now call centre says the refund department is dealing with my case. I have emailed them several times, no response, nothing on the when they are going to refund me, this is absolutely ridiculous. Can you please advise on when it is I will get the refund on my international business class tickets? I have been using SAA for many years and this experience has now made me look for more reliable and trustworthy companies. This experience has really been draining.