Really bad service response

Booking code NKJDHF -A Van Niekerk <br> <br> I needed to book return flight from CT Int to Bloemfontein leaving on March 1 returning March 2. I booked the flight on the Mango app. However, whatever I did wrong, i don't know, but the confirmation email I received indicated I booked a one way flight for Sunday the 28th. Mistake. <br> <br> I immediately called Mango contact centre to make a correction. (within minutes of receiving the confirmation via email) 1st attendant had no idea how to assist. I phoned a 2nd person and explained what the challenge is. I clearly stated that I needed a return flight on the dates as mentioned above. The attendant confirmed to me what I would like and I confirmed again. Said he can sort this out costing me R460+/-, which I agreed to. <br> <br> When I received the confirmation via email, I now had a one way flight on March 1 to Bloemfontein. This flight now cost me R2100 plus rand.I then proceeded to phone the contact centre again and was met with quite a bit of hostility when trying to explain in detail what went wrong and what I needed. Lady said she will listen to the recording and call back. Never heard from Mango. I am on Mango 20 + flights a year & this is treatment??