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。
