Disallow delete option while listening to Voicemail?

If I enter my voicemail (aplication “VoicemailMain”) and go to my new messages folder, after each message I have a few options like

press 5 to repeat this message
press 3 for advanced options
press 7 to delete this message

Is there a way I could disable this 7th option, or do anything so that I could not delete messages?

I checked voicemailMain2 and other applications, I can’t find anything like it.