Travel ends before it has even started with travelstart

Travel ends before it has even started with this company. Alexa would be smarter. Reschedule a flight and that chit-chat ended at 15:10. Email said that we have to pay before 16:50. Email send to us at 14:51 "You are at gate 404" was the response to the url given to us. Have the pay on the same day, the booking change was made: When, what, what account?