fake Dell support installed malware

I called a number I found on what I thought was the official Dell website for technical support.  866-542-8831.  The person who answered immediately gave the name Sebastian Rodriguez.  I was surprised that he didn't ask me for ID, but I disregarded my suspicion when he gave me several numbers to create a support incident-- his so-called employee ID DELL187142, a reference ID CMD92713DELLADMIN298432787, an ID 127147483 and password 37988.  He installed UltraViewer on my laptop then told me his manager Mr. Chris Martin would call me from 561-677-4169.  Very quickly when I received that call, "Mr. Chris Martin" used UltraViewer to install ScreenConnect on my laptop.  The monitor went black but I could see the cursor moving around.  He was capturing my logins to financial institutions.  I disconnected the call, turned off the laptop and took it to the neighborhood repair professional who, fortunately for me, did have time right then to clean the laptop.  Several attempts have been made to login to my bank account which is protected by 2-factor authentication and of course a new password.