I'd say to send a letter to the bishop saying,

"Your Grace,

Our priest said thus-and-such. I wanted to know if this is a new policy from the Vatican, or is this something your Grace has promulgated, or is this something our priest has introduced?

If the first, where may I read about it?

If the second, do you have a decision in writing that I may see?

If the third, may I implore your Grace to please intervene and ask our priest to restore the practice of such-and-such.

Very respectfully yours,
mg"