Caller: Scammer claiming to be Commbank

Claimed to be Commbank. Said someone tried to use my a/c to buy bit coin. Went along with this call for some fun! Acted really concerned. Asked which account they tried to get into. She said she cannot tell me this as its confidential. Told me to put phone on loudspeaker & download an app from my appstore. I kept it going saying I dont have loudspeaker & dont know what appstore is & that I was already logged into Netbank. I dont even have Commnbank ac lol. Hilarious. Told her I think its so funny she thought she had me. Nice try. She hung up!