***** from within Standard Bank ?

I received a Vishing attempt from a landline. She claimed to be from Standards ***** department. When she asked for balance and account details I terminated the call and informed my private banker who confirmed it was a vishing attempt. He said that he would refer it to the actual ***** department to trace the call . I have just installed Truecaller which gives the source of the ***** attempt landline number as "Standard Bank Wealth". Does this mean that Vishing ***** is coming from inside the bank. This is frightening!