You are between a rock and a hard place - and there is an upside and downside to choosing to speak up now or later. Really feel for you in this one.

If it were me, I'd probably call the group, let them know your child told you about the phone call and ask to speak who called your child. I'd approach it as helpful - is there any more info you needed, etc., all the while sowing the seeds of things like, " while I'm sure disabilities would never be part of the determining factors in your selection, I do very much appreciate your proactive approach to determining the needs for accomodations, but rest assured .... "