I was going to say the same as ‘Imaof3’.
the only thing I would suggest is that the ‘kiruv person’ should call your son on his own.. and you know nothing about it. If he asks you if you gave the no. just deny it.. and make sure tho tell this person that you did ‘not’ give the no.
bec anything coming from you is ‘possul’. I am sure you know what I mean.