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帮父母在12月递的申请，交了1070美元的费用。12月20日移民局收到，但是1月4日寄回说费用不对。请问各位老师，能帮忙想想什么原因吗？

-Although USCIS mailroom received your packet on December 20, 2016, probably when the IO processed your documents, it passed December 23, 2016, which was the new fee effective date.

再重新交，费用是1225，对吗？

-Right.

父母还没有79岁。