Refund not paid

I booked a flight on the 26th of November they deducted money from my account due to my daily limit an outstanding amount of R66 was not deducted. After trying to settle the payment but with no luck they cancelled my booking. I requested a refund. They returned only a booking fee which was R143 and promised to give me the remaining balance within 72 hours. I emailed them they did not respond. Contacted them via their contact in their website no response. I emailed them again they promised to followup on my case within 24 to 72 hours until today i am still waiting they are no longer responding to my messages. I really need that money i need to book another flight