About って in the following sentences

Question

って has many meanings in spoken Japanese. Although I have looked it up in the dictionary, I am still confused about it. Please tell me the following usage.

①いいかげんに早く寝なさいだって(please tell me the combination of だって)

②困ったわねえだってさ(this sentence makes no sense to me)

③ない、ない、ないですって(when someone is denying something)

④そんなこと知ってるって(I think here it is contracted form of と思う

Answer 1

The first and the second examples are reporting what someone else said. i.e "S/he told/said ...".

The third one is repeating what the opponent has just said, like "Huh? You said no, no and no?"

The forth one is complaining about how you have to bother to say it. i.e "I know it, I'm telling you!".