TYME BANK ****

I received an email yesterday to inform me that my Xioami was logged out of my banking account and a Samsung SM-A047F-13 has been logged into my account. I was busy working and only saw this mail this morning. I tried logging into my bank via my phone which advised me that I was denied access for safety reasons. I then went to the atm where I saw that all the money was withdrawn from my account. I went to the police station and got a affidavit from them. I did not authorise, nor did I use my pin or ID at any stage to authorise this action to change my banking app to a different phone. So please advise on how to proceed to get my money back. I phoned and was holding on for 15 minutes to talk to the ***** department with no success.