|Doubt I can help on this - I assume these are "answerphone" messages. I see others have had a bit of trouble with delete too so maybe holding the menu button down longer will help. I've seen some mention of using "Mute" but that doesn't seem to fit with the user manual.|
Could be defective so if you bought it in a store it might be worth going back with it. Maybe they know something that neither you or I know, or there is some unwritten trickery.
Always pop back and let us know the outcome - thanks