Hi, in light of this special situation we can offer you a store credit refund. Although we would prefer you to wait for this patch Warner are working on to fix the game. Just contact us here: [email protected]

The game was suspended on steam (no new sales) while they fix the bugs and they are offering refunds from all retailers. This was posted an hour ago: https://community.wbgames.com/t5/Official-Announcements/PC-Edition-Update-June-24th/m-p/575334#U575334

Will gamesplanet honor the refund request?

Locked at 30 FPS.

Please read the notice above the product description

I preordered but can't find Harley Quinn DLC

@Thrifty Number
The "Season Pass" has not yet been added to the "Premium Edition" package in the steam database. https://steamdb.info/sub/66599/apps/
I guess it might be fixed close to release.

Writing a new comment because I couldn't find a way to edit my last one (new to this site, sorry). Turns out that there must be an error on Steam's part because the Premium Edition is in my purchase history on Steam. Oh well, key works great.