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お釣りが間違ってます。
・This isn't the right change.
・You have given me the wrong change.

お釣りが間違ってるみたいなんですが。
・Is this the right change?
・I'm afraid you gave me the wrong change.
・I think you gave me the wrong change.

お釣りが1ドル足りないのですが？
I have 1 dollar in change coming, don't I?

まだお釣りをもらっていないのですが。
I don't have my change back yet.

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