No response on ticket cancellation

I have been trying to cancel my plane ticket for more than a month now. No one respond on email, on the web contact form or on the Whatsapp line. I purchased a flex tick but as the service was so slow/eratic to move dates I had to purchase another flight with a different provide to get my son Portugal. Now no-one responds for a refund. I will never ever use this company again as it seems as though I have thrown R15000 down the drain.