DM when I mentioned Night Mode I meant your phone system. The Voicemail is not the issue here it is your phone system.

Not sure why 2 Mods and an Admin has let this thread go as long as it has already. You really need to contact your phone vendor. The help you require is beyond what can be accomplished at this website.

Replacing your Voicemail would NOT solve this issue. This is a phone system issue, nothing to do with Voicemail.