ZOMBIE THREAD FROM 2018
The problem with zombie threads is that the information and advice may be dated and no longer correct.
@jeanetteartist In this case, the information in the thread remains correct, although the term PowerSeller is obsolete.
Some highvalue sellers can not be negged in FB for seven days to allow time for communication, negotiation and disputes.
EBay does not use feedback to assess member accounts.
Your problem may be covered under the Money Back Guarantee. Have you opened a Dispute?