We booked through a 3rd party. Kiwi.com. Firstly, we were surprised to find that kiwi.com had booked our reservation through United Airlines as FOUR SEPERATE reservations instead of one! Our connecting flight was rescheduled, making it so we would need to be put on another flight. Kiwi.com charged us £680.19 to change the flight to the following day. Kiwi.com had told us that UNITED AIRLINES had cancelled the flight, therefore leaving us with only 2 options. To cancel and get a refund of $100 or pay £680.19 for the next available connecting flight. We paid kiwi.com £680.19. Today, Kiwi.com then announced to us, that our flight from Amarillo to Denver was also cancelled. Kiwi.com gave us 2 choices. To pay £340 to get the next available flight, or a refund of $100. Due to frustration, we contacted United Airlines directly. After 4 phone calls and speaking to 4 different members of United Airlines staff, ( who were very sympathetic and extremely helpful), we were informed we should not have been charged and a refund was given to kiwi.com. Kiwi.com refuse to acknowledge that United Airlines issued a refund. And refuse to answer why they charged us £680.19 for a flight that United Airlines would have NOT CHARGED US FOR. United Airlines then modified our re scheduled flight to a more convenient one the day before at no cost. Kiwi.com have intentionally booked our reservations separately, knowing that any amendments that were to be made, they could charge us for, and claim refunds back from United Airlines. I have kept all correspondence from kiwi.com. Please may I also add, that this makes United Airlines look BAD, and if we had not had contacted United Airlines directly, we would have been none the wiser. We do feel that, SOMEONE should stand by the general public. Today we went onto trust pilot, and found it a disgrace, on the amount of negative and frightening stories that Kiwi.com have. The general public need someone to stop them from doing this to them! It clearly is illegal, they are charging us for something that has been given to them free of charge. I truly hope that United Airlines can at least have them removed from skyscanner, as this is having and will have, a HUGE impact on United Airlines reputation