Rebooking
Due to fly to Johannesburg on 7th May. Received an email this morning advising that the flight may be cancelled. Went to the BA site to rebook for later in the month but got a message "Sorry, it is not possible to change this booking online at the moment. Please call your local British Airways office to resolve an issue that will allow you to make online changes" I called BA repeatedly on 0203 250 0145 and got a recorded message starting with the words "As we looked at the wellbeing of our colleagues first" before advising that the call centre "cannot accept your call at this time". The message then advises me to go back to BA.Com to make changes to my flight. Any suggestions as to how I can rebook my flight?