Cant log in my account

I can't log into my account, even though I know the password and email, but still I cannot log in to my account.
Because I'm not getting 6 digits security code due to email address, because the email on which security code is sent or coming that is not in my use.
And that email address was for the sake of log in, it was not the email which I was using for an email.

So now how could I get security code from that email which was never in use and it was just for log in purpose. And now I tried to log in to Google account and email, but now Google is not recognising that email aswell.

Plz tell the way by which I can log in to my account without security code.

Thanks!