I guess most answerers are flummoxed by this also, judging by the singular lack of answers.
I can only summise that the question is seeking you to say that customers COMPLAINT, DEMAND or REQUEST action when they want a particualr action by you, depending on how strong their desire for action is. But that seems so blindingly obvious, it is stupid.
I suppose to get the bonus points for answering well done could then go on to state the methods by which which customers might do this - appear at the counter to complain in person, phone you up, write a letter, ask a solicitor to write to you, involve Trading Standards and so - but it is the use of the word 'behaviour' that seems obscure.