Pathetic service

My mother and other people missed flight JE152 on the 27/08/2015 because the flight was closed 40 minutes before boarding (booking ref: MWCVNB). We arrived at the check in desk and we were informed the flight closes 30 minutes before departure. We were referred to go to the ticket office, and the lady there said we must speak to the flight controllers to open the gate. we went back to the check in desk, we asked to speak with the flight controller as informed. the guys laughed at us and said we should go away. As were arguing with the check in guys, Kulula who also had a flight flight departing the same time as mango flight, started announcing that they are making the final call for the flight departing at 1155hrs and this was now 30minutes before the departure. One of the check in ladies spoke to her colleague in xhosa and said they closed the flight early. Unfortunately my mother and a few other clients were connecting in joburg and were were forced to go and book kulula departing at 1245hrs so that they could connect. This was just pathetic because we were told at mango that the next flight to joburg was at 1445hrs and mango does not refund. Mango's service is terrible.