They all do this. I've had games or dlc vanish off my PlayStation account. When I called to complain, since they lost the records of my purchases, they won't return them. I lost the receipts so long ago. I still have save files that require the DLCs
I normally don't advocate for piracy if you can afford games, but if company doesn't even allow you to buy them, then what other option is there? It's like they want people to pirate their games.