We do not give refunds.
Under no circumstances do we give refunds.
That we do not give refunds is made abundantly clear in the membership application form that applications choose to “agree” to before they pay.
You can go WWOOFing to as many Hosts as you like, as many times as you like, during your active membership period.
Please check you travel arrangements, so that you can be sure you are coming to Japan and can use your WWOOF Japan membership as planned.