DO NOT FLY BRITISH AIRWAYS

I have been contacting British Airways for over a month to get a refund for a plane ticket they charged me double for! They reply with a link to a bot which does not offer a solution to the problem, and simply ignore me when I comment on their Facebook posts! They refuse to provide an address for a letter of demand. i have given them sufficient time to respond and sort out the issue. I am now submitting to the ombud as well.