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Write to the Congregation for the Doctrine of the Faith (CDF). That commission addresses doctrinal questions.
From the profile page of Congregation for the Doctrine of the Faith
E-mail: [email protected]
For an example, which is relevant to the current discussions in the Church, please see this CDF October 22, 2014 response to the Question of a French Priest: "Can a confessor grant absolution to a penitent who, having been religiously married, has contracted a second union following divorce?"