There is no adjustment mechanism for “accidentally purchased packages” in the game. If you have this problem, you will need to contact your payment platform (iOS App Store, Google Play Store/Weibo/AliPay) for a refund. Once that is resolved, you can repurchase another pack in game if necessary. Please be very careful when purchasing Gift Packs to avoid an “accidental purchase” situation as much as possible.
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Game Guide for Last Empire – War Z