I flew with my 6 year old son from Hyderabad, India to Denver, Colorado via Heathrow, London on July 21 2022. My flight from Hyderabad to London was delayed (Not sure what was the reason for delay) for 2 hours. Because of the delay, I missed my connecting flight from London to Denver. There was no help or guidance at Heathrow airport on what to next. Waited in line for almost 6 hours to talk to someone and they rebooked me for 23 July. My son has lot of food allergies and he really can't find many options to eat outside, so requested them to give me a flight for 22 at least and I told them that I would pay extra if needed. Customer service representative said that your are lucky to get the tickets for 23. I was looking BA website and I see that the tickets are available and when I mentioned about it to customer service representative, she said that is how BA makes money by overselling the tickets and will put the customer on standby when there are no tickets. At the end, I was forced to fly on 23. I have a Indian passport, for me to stay two days in London, I need to have a transit Visa and I don't have it. When I mentioned that to customer service representative, she said that I am fine and boarder security will let me go out as I am flying back on 23 and asked me to show the travel itinerary. I followed her recommendation and saw the security officer and he said that he can on allow me to go out for one day as per the procedure. I explained everything to the office and asked him for the options that are available for me. He was so helpful, he went and talked to his chain of command and let me go out for 2 days. BA representative gave the voucher for only for a day and asked me to pay for the second day and apply for repayment. It was British Airways mistake and not sure why they can't give the hotel for the entire stay, Imagine the people who did not have credit cards or enough money to pay for hotel and food. My Cousin lives in Hounslow and I was so lucky to him there as my son's food allergies we really can't eat outside. So, I called my cousin and stayed with him for 2 nights and came back to Denver, Colorado on 23 July. I have seen many other people missing their flights to Atlanta and some of them were flying with their elderly parents. One of the passenger got her ticket for 25th. I understand that the customer service representative were helping so many people, but they are mean and taking lot of time to help single customer. Overall it was the worst experience that I ever had and I would never use and recommend not to fly using British Airways.