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UPDATE: possible solution
TLDR: Go to the Packs or Points tab in the store in game to force a refresh of your coins via PS store.
Before I emailed support I decided to do the old POE 1 trick of opening the shop in game. When I went to the "Packs" or "Points" pages it loads the PlayStation store in the game. After a long time loading, the UI to buy packs came up and my coinage updated.
This worked for me. Stay safe exiles.
This helped me today, after I bought 2 packs on 200 coins and none appeared in my shop tab. But "scrolling" to "Points" tab (use L1 on Playstation) triggered a refresh and both purchases apeared.