IMO, I'd highlight that its actually not their phone number rather its a Twilio number etc which is used to call them up.

So I would change:

  we would give you a number for the other group, and YOU WOULD CALL THEM (not us) TO APOLOGIZE. 

To something like:

  we would give you a number for the other group which does not reveal their actual phone number, and YOU WOULD CALL THEM (not us) TO APOLOGIZE.

The reason for this, is if users read your company blog it may put them off when/if they read it as, I immediately assumed that their number is be given out which could lead to confusion.