Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry to hear of any issue with these phones.
To help you with this issue, may I ask:
1) The FULL Model Number of the phone system you are working with? If this is a cordless system, that model should be printed on a sticker on the bottom or back of the MAIN base and START with KX-TG.
2) What phone service provider (phone company) you have for this phone line?
Since you have asked your question on JustAnswer.com - which is a pay-for-help site, and mentioned you do not intend to pay, I will refrain from providing an answer for you.
Please understand that we experts DEPEND on payments for our livelihood and are unpaid by this site.
Let me know if you change your mind.
Sorry that I didn't see your response earlier.
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