I have been locked out of my cra account. I am trying to access my 2019 NOA. I need line 150 of my 2018 return in order to access my account. How do I get this number?

I cannot get line 150 of my previous return without accessing my account. However I cannot access the account without this number. I am currently in tears. I was given no explanation for why I was locked out of my account.