Flight Delays

Booked on a 3pm flight Saturday 15th June, BA6425 . Receive an email and sms at 11 30am this morning saying flight is delayed by 3.15 hours - no reason / explanation given. I phone BA , its weather related.... perfect weather in Jhb and CT for the last few days....??? Apparently fog at CT Airport.... delays carried over from yesterday.... check in staff completely unhelp and disinterested . No explanation could be given, I phoned a friend who works for Comair to find out what the delay is about. I am now paying for car hire for a day which I cant use. We were going to attend a 21st birthday party for which we will be to late to attend. Flight just moved 30 min later again... now only flying at 18.45 .... very dissapointed with the lack of communication on BA side