Since your thread was closed, I wanted to clear something up:
@Hooper suggested using Privnote to share your course so admins can’t access it. This is not currently allowed
That being said, I agree that admins shouldn’t access sensitive content unless a dispute arises, or if there are security or legal concerns with the material. Otherwise, there’s no need for unpaid individuals to view it. However, requesting to close the ticket before the buyer has even received the product is concerning. You should deliver the product and allow the buyer to confirm receipt before the ticket is closed. Whether they’re satisfied with the content is a different issue, but the delivery must be confirmed first.
Ultimately, staff can decide what works best, and maybe that’s for the better—but that’s just how I see it.
References: