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Another one of vs for question, here for would be the right choice, because its use denotes the function of purpose as I think it's the case here, right ?

When customers complaint of an error scenario.

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closed as not a real question by MετάEd, Kit Z. Fox, FumbleFingers, Mark Beadles, Robusto Jul 31 '12 at 16:07

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

I think you mean complain. Complaint is a noun. And as a dictionary will tell you, people complain about things, not of or for. – RegDwigнt Jul 31 '12 at 11:49
@RegDwightАΑA complain of is somewhat valid, it is an older style use. – Matt E. Эллен Jul 31 '12 at 11:59
You can also 'complain about . . .' – Barrie England Jul 31 '12 at 12:03
books.google.com/ngrams/… – asymptotically Jul 31 '12 at 12:52
Your example is not a complete sentence. This makes it difficult to tell exactly how you want to use the words. – Mark Beadles Jul 31 '12 at 13:28

In normal text, the most frequent prepositions to follow complain is either of or about, with about more common in modern usage. Here’s an OED citation of each version:

  • 1856 Froude Hist. Eng. (1858) II. viii. 255
    The government could persuade themselves that evils no longer complained of had ceased to exist.
  • 1986 Guardian 11 Nov. 12/5
    The prisoners have complained about restrictions on visits, excessive searches and, above all, brutality.

The OED says that complain for is obsolete. It meant to lament. Several other possible prepositions now rarely seen occur historically, but have now all become obsolete, or at most, poetic.

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First off, you need to learn the difference between "complain" (verb) and "complaint" (noun).

As a verb, this is the paradigm of "complain":

complain -- complained -- complained 

So "complaint" can't be made to act like a verb.

You could change your sentence fragment this way:

When customers lodge a complaint/ complaints

Either this or just change the verb to "complain."

About the preposition, the pattern we normally use is:

complain + (to somebody/ a department) + about something

"Of" is also possible but not "for."

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