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Hi there,
Could you please explain to me what is the difference between "have not been" and " have been not".

Appreciate your help
G.E
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denatraCould you please explain to me what is the difference between "have not been" and " have been not".
Anonymous's response offers a very specific structure in which the second form can be used. It cannot generally serve as any kind of emphatic form of your first.
Comments  
Some examples of usage (US usage):

"They have not been happy at all with the court's decision." This is the usual word order.

"They have been not at all happy with the court's decision." This is acceptable, but out-of-the-ordinary word order. The meaning is the same as the sentence above. This type of word order might be used for emphasis or effect.
 Mister Micawber's reply was promoted to an answer.