Fellows, before jumping to conclusions based on no information, consider that these are not normal times. People are getting sick and some are dying. Others are struggling to make ends meet. I haven't had any dealings with Jamie in several years, and don't know the current status.
That said, I don't see any posts about folks buying his grinder kits for several years. His website says the SLING grinder is no longer available, but doesn't have any other info about the status of the GIB and tongs.
Try a few emails and a few more phone calls. If there is no contact, then cancelling the payment would be wise.