Horrible treatment at British Airways Comair

My husband, my sister and I were supposed to fly out from Zimbabwe to Johannesburg on the 12th of March 2022 at 13:55. The flight was canceled due to operational reasons. British Airways failed to address people of the situation. Theyre organizing an alternative flight only for Monday the 14th with no option for passengers accommodation, catering, Covid tests compensation as these are valid for 72 hours. There was an airline, available with seats, British airways'response was that they do not have a relationship with the airline. Considering the magnitude of the situation a plan could have been made!!! People have been left stranded, people have plans, appointments, work commitments in South Africa but British Airways, Comair seems not to care!! I'm extremely disappointed in the airline, the lack of hospitality and humanity!