I recently heard about an incident where hanging up turned out to be more difficult than it should have been. Stay calm. Call from another phone perhaps?
https://bc.ctvnews.ca/beware-of-the-delayed-disconnect-phone...
https://bc.ctvnews.ca/beware-of-the-delayed-disconnect-phone...
https://security.stackexchange.com/questions/100268/does-han...
If it does, then you should be able to infer that the previous inbound call has (probably [1]) hung up, and it is now safe to call your bank.
[1] A sophisticated enough scammer could hold the line, give a fake dial tone, detect that the number you are dialing is not the bank number they expected you to dial, dial that number themselves on a different line, and relay between that line and yours to convince you that you really did have a clear line, and then keep holding the line when you then hang up and try to call the bank.