Caller ID announce doesn't work correctly

I thought if I entered in the name of unidentified callers (not blocked, but cell phone calls that only show the number and not the name) that it would display or announce them correctly when the person subsequently called. Not. It still says unavailable (again, it's NOT blocked), and just announces "you have a call." (Duh, I know that--the phone is ringing.) When I try to enter the name into the phone book from the caller ID log after the person calls, it takes the entry, but it doesn't "stick" and the next time the person calls, it's the same thing--unavailable, you have a call. Since that's the only reason I bought this phone, I'm very disappointed. I wouldn't have bought it if it weren't for Timex's good name. Shame on them.