Originally Posted by BA or bust

I think this is one of those cases where you should send a formal letter by recorded delivery and mark it as such at the top of the letter - so whoever reads it - as opposed to whoever opened the envelope (and may have discarded it) knows you are serious. Base it on flarmip’s points from post #7 above. Just state the facts, you tried to cancel but could not due to BA not responding to your call. Not sure how things work between airline partners, but I would be very surprised if CX charged BA the ‘full price’ for your no show. If correct this means that BA has effectively profited to an extent from your misfortune, which is not right IMHO. So they should at least be able to provide some return of Avios.