Lack of communication after flight delay and bad customer treatment

On 28/04/2019, Mango JE265 was supposed to depart at gate C12 from Johannesburg to Durban at 17:40. Flight was delayed by 30 minutes. At 18:15 boarding gate was changed to E2. Arriving at E2, the Mango staff advised that the flight has been further delayed but they don’t know for how long (we must just wait). I went to the restaurant next to gate E2 and after sometime I saw a new boarding time of the screen as 19:40 (2 hours later) but the flight was not there. I waited hoping that they will announce when the flight is available until I was tired of waiting and went to gate E2. When I got there, the lady told me the bus just left and why did I not hear when they called everyone else. She added that they called on my cell and at the same moment around 20:04, I got a call from Mango asking where I am as they are boarding, I responded that I am the boarding gate but they lady says the bus has left. They spoke and she said there is nothing she can do to get me to the flight as there is no bus (flight was still there and they never announced after almost 2.5 hours delay). She then referred me to Mango guest, getting there I met ladies who told me they closed and unfortunately they cannot help me. They advised I must go away, book a hotel for the night as well as another ticket for tomorrow. I told the lady I cannot afford her recommendations and she gave me the call center number which I tried calling and no answer. Checking my SMS there was a message sent by Mango at 18:40 saying that the estimated departure time is 20:03 but this is the same time when they called me while I was at the gate and at the same time I was told the bus just left and flight is already reversing and nothing they can do. Thanks to SAA for helping me very quick to get into their 20:45 flight using my last cash else I would be missing an important meeting tomorrow morning. The customer experience and how they dealt with the whole situation was unacceptable from a brand like Mango. I understand delays do happen and that is not the issue but communication is key after creating so much confusion. I would be glad if Mango can at least refund the additional ticket that I had to buy due to this unfortunate incidence which I don’t wish for anyone to experience from a reputable brand like Mango.