What options does a coach have?

[Altor]

So I got another one, and I'm curious how you all would have handled it.

A1 commits a common foul on B1 for team A's 9th foul of the half. The official reports the foul and signals for 2 shots. As he heads opposite table, he signals 2 shots to his partner. When he turns around, the table tries to get his attention that it should be 1-and-1. Partner tells the players 2 shots and bounces the ball to the shooter. Now, the timer is hitting the horn to stop the action, but nobody blows their whistle. B1 takes the shot and misses it. As expected nobody plays the rebound and the ball is given back to L who then looks at what the table wants and discovers the error.