British airways flight rescheduled last minute - no comunication

British airways rescheduled their flight ba6285 to victoria falls from 1120 on 15 april to 1300 and didnt communicate. I only realised the flight had been rescheduled when i checked in. There was no communication, no apology no attemp to provide alternative arrangements for passengers whose flights were tome sensitive eg i as a result was going to miss a wedding ceremony as a result. When i raised my concerns with customer service at or tambo who initially didnt realise the flight had been rescheduled (i brought it to their attention) they basically said they couldn't help and it i wanted to try an alternative airline (which was available) i could go right ahead at my own cost then apply for a refund for my ba flight (which by the way takes weeks) . In all of this there as no acknowledgement of wrong doing and definitely no apology. None whatsoever . The staff i dealt with were arrogant and not sympathetic.