Fair Catch Rules

[thesnackman]

At a high school football game last night, the visiting team dropped back to field a punt on fourth down. After signaling for a fair catch, another player from the receiving team came up and made the catch ( the player that called for the fair catch didn't catch it); then he started advancing the ball. After the play was dead, the officials called a 15 yard penalty on the play but didn't specify what the exact call was. Was this the correct call?

Josh