Bad Service from Mango Airlines

I have a booking for a return flight from Durban to Cape Town in December 2018. I need travel assistance by means of a wheelchair. I filled in the necessary form for assistance and emailed in 0n the 17th November to the medical department. I requested that they confirm receipt of same. No reply!! I emailed them again on 20th and 22nd asking for the same - no reply. I went onto their fb page yesterday morning to complain and was told that someone from their customer care would contact me-no contact. I do not want to arrive at the airports in question and have no assistance. It seems to me that once you have forked out cash for your ticket their interest in you disappears. Shocking service. NEVER AGAIN WILL I FLY MANGO!!!!