Good evening @Poshalaraghu,
Welcome to the Rogers Community and thank you for your post! Receiving voice messages is a must, so we definitely want to help you sort this out.
Do you have a regular voicemail or an iPhone Visual Voiemail?
Do you normally deactivate mobile data when you're connected to Wi-Fi? I'm wondering whether this happens because your data is turned off or because the Wi-Fi connection is enabled.
Looking forward to your reply!