佬友们，我想了解一下gpt订阅内容
假如说，这个月用了一周pro 5x，现在想升级一下pro 20x，苹果订阅会退还一部分pro 5x 费用吗，还是怎么一个流程 4 个帖子 - 4 位参与者 阅读完整话题
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