^NOY- had the same issue as you when using the automated on line system - showed error etc and still showed credits on my dashboard. On checking the APP on my phone activity showed I had submitted an upgrade request and it was in progress. 16 hours later had an E mail from Priv Club confirming upgrade and deduction of said credits which by then had disappeared from my dashboard / account. they also sent revised new ticket with new class of travel and PNR