Delayed flight no correspondence

Flight BA6417 which was to depart at 12.50pm today from JHB has not yet left. Standing in the queue waiting to board no one advises what the problem is. Passengers have to ask what is going on to get an answer. Now there is a plane departing at 2pm BA6419 but they dont use that plane to assist us whislt they fix the our plane. We now must wait a further hour for them to fix our plane. So we must be delayed for over 2hours when the could have assisted us sooner. I changed my afternoon flight this morning to get home earlier as my father is in hospital...but those problem is that? Will BA refund me for the change in flight as I am no longer getting home earlier. I will no longer fly BA, every time I fly with them there is a delay or a problem. Its pathetic and us as paying clients deserve better service...BA charges premium prices but cant deliver in service.