The best and quickest way to contact Sketchfab Support is through our ticket form.
Our Product Support team is a couple of real-life 3D human beings, so they’ll review your message and reply to you as soon as we possibly can.
Due to the size of the Sketchfab community, we're unable to offer support via phone or video. The best way to get the fastest answer is to submit a ticket through the form with the most complete information possible for your issue/question.