I do not think so.
I don't see it like that.
そうは思わないけど。
I don't agree.
そう思わない。
I don't think that is the case for that.
I don't agree.
I do not think so.
I don't think that that's the case.
I don't think that's the case.
I don't think that at all.
I don't recall.
そんなはずないよ。