First make sure it really is wrong! Check the latest Style guides, instructions for authors, and/or get some examples of recent publications and identify all the errors.

Then submit an error report on the styles forum.. Use the subject Style Error:[Name of style]. A volunteer will often fix the style within a few days of even hours.

Much of the advice on requesting styles applies.

If you have just a little technical ability, you can make small changes yourself quite easily, though if the style is genuinely wrong, it's better for everyone that you report it and get the style at the repository fixed.