Illegal number--NCAA

[TriggerMN]

Hi guys, I do not have an NCAA rulebook and cannot find the answer after an online search.

Scenario: During an NCAA game, it is noticed during game action that A2 is wearing jersey #7. It was not caught by the referee or official scorer before the game began when reviewing the scorebook. What is the penalty?

If the issue is noticed before the game starts, but the team refuses to change the jersey number for whatever reason, is the player still allowed to play, with the same penalty to begin the game?

Class A or Class B technical? POI? How many free throws? Team foul or personal foul? Thanks.