I’m booked on Asia miles ticket from ORD to BLQ thru LHR on BA 294. BA wet leased that flight to air belgium and have sent out an email that I am eligible to change my flight. The one world guidance is outlined in the BA forum (https://www.flyertalk.com/forum/35374730-post38.html) and it’s clear I have to rebook thru Cathay.

I have called 3 times and no one is able to get a copy of the waiver in place by BA and they all do not know what the One world liaison is. Are there other options I should reach out to? Twitter/e-mail/specific call number etc?

Thanks in advance!