Remove Test "Stores Orders" rows?

Does anyone know how we are able to remove test rows placed into the LIVE Stores Orders collection? My clients dashboard now shows he has taken over £6,000 overnight!

I am using the wixStoresBackend to createOrder(); after external payment services and tested the site in preview mode. However stores has no sandbox database;
I cannot go into dashboard and click “cancel order & refund” as this is broken due to not being paid for through wix pay system;

TIA