@Jerry-And-Natasha0
Do not issue a second refund, just let Airbnb work on the excisting refund.
Maybe the guest can also contact Airbnb "when will you process my refund" ?
Put some pressure on Airbnb CS, otherwise nothing will happen.
Next time use the "change" option in a reservation (if reservation has not finished yet) to amend the price for a stay, as then the Guest Service Fee will also be recalculated and the resolution centre is not used when refunding this way.