I had a similiar issue as pochi but accepted the refund with a huge ”penalty” as they called it, just because I didn’t want to have anything more to do with this joke of an airline. This was May 28th and I haven’t got a cent from them. AMEX is trying to solve the case but so far no luck.
They don’t respond to emails. I really think the airline should be thrown out from oneworld because they really are not doing serious business.