Bad Service - Refuse to pay back my money

I bought a return flight airline ticket from Fly Blue Crane, at OR Tambo International airport to fly to Nelspruit and back on the 24th of October 2015. 2 days prior to the flight, a lady with the name Dayle Littlefield from Blue Crane, phoned me at about 8 o'clock the evening to tell me that my flight was cancelled. They could organize another flight the day before. It was not be possible, because I couldn't get off from work on the Friday. She then told me to buy another air ticket from SA Airlink and that they will refund me with the whole amount because the cancelled my flight. I have to buy the new ticket and to notify them by mail, which I did. I phoned her on a daily basis to find out why they do not pay me my money back. Every time, she had excuses and that she was terribly sorry. The last 2 to 3 times that I phoned her, she was terribly rude to me saying that she haven't got the time to speak to me, that the money was paid into my account and that there is a problem in my bank. It is now almost 2 weeks. Every day, there is new promises. Can you please assist me in getting my money back. The amount is R2706.84.What about the interest to my account?