Have not had

[FalaGringo]

I would like to know if it is ok to use "Had not have" and whether "have" can be removed from the sentence without changing it's meaning?

Examples
"If you had not spoken to him, we wouldn't be in this mess."
"If you had not have spoken to him, we wouldn't be in this mess."

 

[Barque]

"If you had not spoken to him, we wouldn't be in this mess."

"If you had not" is fine here.

"If you had not have spoken to him, we wouldn't be in this mess."

"If you had not have" isn't grammatical. I can't think of any context where it could work.

changing it's meaning?

As a side note, you need "its", not "it's" there. Maybe a typo?

 

[Barque]

"If you had not spoken to him, we wouldn't be in this mess."

There's still something about this that feels a little off to me.

I'd prefer:
If you hadn't spoken to him, we wouldn't have got into this mess.
We wouldn't be in this mess if you hadn't spoken to him.

 

[5jj]

The contracted "If you hadn't have spoken to him, we wouldn't be in this mess" is commonly heard. as is "If I'd've known ...".
They are considered incorrect, but many will not notice.

 

[5jj]

There's still something about this that feels a little off to me.

The contracted form is more common, especially in speech, but there is nothing wrong with the uncontracted form.

 

[Barque]

"If you hadn't have spoken to him, we wouldn't be in this mess" is commonly heard.

In England? I think I've come across "If you hadn't of", which I suppose is a variation.

as is "If I'd've known ...".

Yes, this is familiar.

The contracted form is more common, especially in speech, but there is nothing wrong with the uncontracted form.

I wasn't referring to the contraction so much as the use of "we wouldn't be" (instead of "we wouldn't have"). For some reason "we wouldn't be" sounded better when I interchanged the clauses. Maybe it's just me.

 

[5jj]

In England?

Yes.

I think I've come across "If you hadn't of", which I suppose is a variation.

It's commonly the spoken version of "hadn't have". Some mistakenly believe it is "hadn't of" - mistake upon mistake.