Call their CS and ask them to waive it as a one-time courtesy.  You got nothing to lose.

试了，人没同意，等我有心情再试试看。不过PUT IN CREDIT LIMIT INCREASE REQUEST 了--这个会伤CREDIT SCORE吗？这卡是俺唯一的2% CASH BACK卡，所以虽然CL底我都狂用来的，还想更多地用。

did you call them right after your exceeded you credit line?

有的银行是把late fee和overlimit charge算做一回事的，如果之前要回过late fee，不一定会再给你waive overlimit charge了。不过再打电话试试也无妨哈。

提高了limit会伤一点分数的，不过总比每次都刷爆了来得值。