Victimized by SIM card swap scam; would like to engage T-mobile regarding aftermath

Criminals first change personal email (yahoo, hotmail, gmail) password by receiving password reset code on the phone after sms swap. 

Interesting. 2 more questions:

1. How will the criminal know my email address associated with my financial institution unless it was compromised as part of the breach? I use 4 different email addresses for different purposes (one for financial services, one for other services like TMo, Netflix, etc, one for personal email and one for everything else).
2. I was a victim of a TMo SIM swap scam yesterday. I never got an SMS asking me if I initiated a swap. After the swap was completed, my daughter who is the primary account holder got an SMS that the swap was successful. She immediately asked me if I initated the swap and I noticed that the signal strength indicator on my phone had disappeared. I immediately called my broker and bank and blocked all my accounts (11 accounts across both). Both asked me a lot of personal info to confirm I was the legitimate customer. I dont believe the scam artist will have access to all the needed information to muck around with my accounts. In fact, my bank asked me to hang up and then called my wife's phone to continue the discussion. How can a bank share any of a person's credentials with only an email address and the phone number associated with the 2FA. By the way, I drove to the TMo store and got a new SIM - yes, 2 TMo employees at the store authenticated me to do another SIM swap.