Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry I didn't see your question earlier and to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) The FULL Make & Model Number of the phone system you are working with? That information SHOULD be printed on the outside of the package it came in.
2) Did your son include a "gift receipt" in the package, or may still have one?
Please REPLY using the box below and the SEND button.