http://j4yryxwbt7ibqcittnhyv7w4sfy4qmtzjvxew3373tyn3x7bgnmgspid.onion/faq
Q How often does support respond? Support responds within 2-24 hours on any given day of the week. Q How can I fix an error on postage I’ve already paid for? If you're facing an issue with a shipment, try pressing the "Repair Shipment" button on the order page for the shipment in question.