Absence of customer care from Mango Airlines

I booked a flight with Mango from OR Tambo to Cape Town on 29th September. I received a notification that my flight was canceled and was re-allocated to a flight departing about 3 hours later, which was not working for me. I proceeded to cancel the flight via phone as there was no alternative suitable mango flight, and was told that there would be no fee, and that both my Voyager miles and my credit card payment would be refunded. I was anyway keen to have this response in writing, so I wrote to *** on the 24th of August. I did not receive any response. I checked online the status of my booking (SPKCVL) and I saw that the booking had been canceled but there was a R200 fee. I tried to call customercare but after about 25 minutes of waiting, I hanged up. Wrote again an email at the guestcare address today, still no response. This is highly unacceptable, even more considering that the changes were imposed to me from Mango. I have received no refund, no communication, and the R200 fee still appears on my booking. Completely unacceptable.I hope this mail will wake customer care up and decide to respond to my query.