Worst customer service ever

Worst traveling experience ever. I chose a specific flight from South Africa to Belfast due to flight time and duration to best suit my 13 month baby, ensuring she will sleep through the night for most of the flight. After a 4 hour delay and passenger issues we flew 5 hours later. On arrival in Heathrow our connection flight left and the new connection was 4 hours later. 30 min before the flight British Airways cancelled all of their flights and stated that we need to arrange new flights and our own flights. Being in transit, in a new country, and need to arrange accommodation and travel to another country with my wife and frustrated baby was the most traumatising experience ever. Some employees had compassion and assisted us with a connection flight for the next day, but due to all flights cancelled all hotels were fully booked. At 1AM someone said that we cannot stay in the airport and after earing our story managed to arrange a hotel where we only had 3 hours to spend before we need to move back to the airport for our 5:55 flight. On arrival in Belfast all of our luggage was gone. After several attempts we still have not received everything.