Well, it was a business class ticket (not fully refundable) CAI-BKK-CAI, departing June 2020. Needless to say the flights were cancelled by WY, so a full refund should have been in order.

I rang them again only a couple of days ago to chase things up and they were not helpful at all.

I feel there is little more I can do, as my bank was not interested in doing a charge-back (Covid was mentioned).