Hello & Welcome to Just Answer,
Sorry to hear of the issue you are having with your phones.
According to my note, this particular phone system can store up to 250 phone numbers in the call block list.
Do you know if you have anywhere near that number stored AND if so, are there any that are no longer needed?
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, ***** *****--. .-(im)