Disclosing to a 3rd party

This morning I received a call from my mom that people from Absa have been calling regarding a personal loan I took, and that the number they have the people that answer keep in swearing. The person that called said her name was Martha. What I find strange is why would she disclose such information to a 3rd party? Don't you authenticate before disclosing what the call is about? Absa and its pathetic values I'm really disappointed and need someone to explain to me.....