Poor Customer Experience on Refund request.

I logged a refund request on 3 December after my flight times were changed for a return flight from Durban to Cape Town that did not suit my travel plans. Chantel McClean dealt with this. I've sent numerous emails and got a response once. Informing me that the refund will be processed by the 13th. Till today the refund has not been processed with no feedback from Mango.