S A Express Refund

I had a flight on S a Express from George to Johannesburg on the 1st June when they were grounded. I had to book another flight plus accommodation because I had a connecting flight that day. I booked the S a Express flight 11th February 2018 . I am still waiting for my refund. I am constantly calling and sending emails they keep saying we will get back to you but no refund. Has anybody had the same experience and please advise how I can get my money back. Thank you