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think you'll just have to wait til the free weekend is over then resync your account

Re-Sync account.

Do a manual sync on Wednesday, so that auto syncs won't happen and do this during free weekends.

If your account has auto synced and said you own the games already, nothing can be done. Not even Support can change that.

afaik there's no way to do it
though you can avoid it happens again by manually syncing your account on a midweek day, as it then re-syncs every 7 days and you'll this way prevent free-weekend games from showing up on SG