PATHETIC service once again

My son was at check in 5 minutes late, this was BEFORE his flight leftHe was told to go and rebook. Then he was told to pay in an amount, and the next flight is only on Saturday and that the money I PAID is non refundable...Can I have MY MONEY back please and today still. The child was late because of WET ROADS TO THE AIRPORT and his Uber driver could not fly over the traffic that the rain caused. Should I not here from British Airways today, im going to post this ALL OVER so that MY MONEY is refunded....