[US]How to get rid of these calls saying “loan application has been approved”?

A user reports receiving frequent scam voicemails claiming loan approvals, which their wife has been getting for over a month. The calls, often about debt consolidation or unsecured loans ranging from $26K to $70K, are blocked and reported, but the user seeks ways to stop them. The voicemails only appear on the wife's phone, linked to the user's Apple account.