who and what I should ask whether to extend the labour contract?

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My labour contract will expire after a month.Next week,there will be three new staffs register to my department. In accordance with plan should only have to increase two staffs. I'm worried about whether the company decided not to extend the labour conteact. who should I ask for?and what should I ask about? a.HR,but their decision usually depend on the manager's decision. b.team leader,her words have important reference value.But she don't like me,we are clash ofpersonality. c.Department manager,he has the final say,is a person not like to ask for trouble If you are me,how to make it?