I think you are referring to the local bishop of the time. However, once the then Yugoslavian Council of Catholic Bishops found out, it was escalated to Rome. John Paul II then intervened and stopped the local bishop from interfering. He instead commissioned another investigation.

I have been to Medjugorje 5 times as of today. I plan to return again. It is a very special place. Apparitions aside, I have not been to a place where there is so much peace, so much desire for prayer, and so many fruits of conversion, as evidenced by the sheer number of people attending Adoration every day and the astounding number of Confessions. Someone once said it is the closest place to heaven on earth. I attest to this statement.