Airline specific issues cost me

Monday 14 Mar, weather delays affected most flights at OR Tambo with my return BA flight delayed from 18:00 to 19:40 initially, then updated to 'delayed indefinitely' due to \operational issues\". I was sent back and forth from staff at BA/Kulula desks to try and get further information re the problem and extent of delays with no success - one staff member said it's a mistake - the flight delay is weather delayed with another mentioning that there were indeed operational issues - and could not provide any more information re time etc. I had to make a decision to either stay in JHB or move the flight to the next day (given that plane may not even fly that night and my CT meeting already missed). I'm sent to ticket desk - extremely unhelpful who tell me I must pay R800 to change flight (as it's due to \"weather issues\" not technical/operational). I explained it's due to 'operational issues' as announced twice-I get ignored point blank. By this stage I pay the R800 required to change the flight & pay price differential (for downgrading from BA to Kulula) as I needed to ensure I could still catch Gautrain back to Sandton and make the necessary changes to my schedule. "