@Carmel36
Was the refund processed via resolution centre, did you change the reservation or was it automatically done by cancellation policy ?
Airbnb financial department is probably involved (issue is escalated to them) and they need to investigate and maybe try to get the money back from the guest. It is a "back office", can not be contacted directly, only via Airbnb CS. It can take a long time and in the mean time you only can wait or ask for status. (I took me 9 months to have a payout issue resolved....)