Facebook can't log to primary account

Hello Dears,
I have a problem of my FB account.
I m a normal user so I have no security
setup of my account. Once I can't log into
my account because it says incorrect password.
So I tried to reset my Fb password.Then Fb
send reset code via sms to me( I singed up
with my phone number).So I could reset my
password with confirmation code . And then,
Fb asked for a photo of myself , so I uploaded
my profile picture of my account. Finally,
Fb said such meaning like " We are checking your informatoin and then we reply later u after all check up ". Thus I waited for 2 days and then, I logged
into my fb account with my phone number(which is one I already set up) and new password.
Luckly I logged into my account, But
that account I logged into is not my account.
But it is created by my phone number.

So how can I get back my primary account.
Please Sir, help me.

Respectfully,