Hello & Welcome to Just Answer,
Sorry I didn't see your question earlier and to hear of any issue you are having with your phones.
May I ask:1) Can you CONFIRM the FULL Model Number of the phone system you are working with?2) What phone numbers (from what list) are you trying to erase?
3) Do you have the FULL manual for this phone system?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved.
I look forward to any further questions or results that you may have.
Thanks, ***** *****