No response to complaint

I sent an email to Kulula's customer services email address on the 28/09/2015 about being charged a ridiculous amount to change a return flight to Durban for me, my infant and my toddler. I have had no response from them and am incensed as it cost me roughly R 7100 for a return trip to Durban which is ridiculous - being charged double airport taxes and a per leg per person seat change fee. I am sure they resold my other ticket which I changed from peak flight times to off peak - surely a flight change should be capped at a certain amount because paying almost double the original ticket price I find unacceptable. <br> <br> A response to my email would be the least you could do Kulula.<br>