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) Is there a TIME STAMP showing - for the missed call? If so, does it MATCH the time that the call came in?
2) How many TOTAL cordless handsets do you have with this system, and if more than one, does this happen on ALL handsets?
3) What phone service provider (phone company) you have for this phone line?
NOTE: If you see ANY requests for "additional services" - such as a phone call - please understand that these are sent BY THE SITE (and not me).
Feel free to DECLINE any such offers, and continue in this text/chat form.