Cant log in to facebook

Hello, I am getting  "you need the official whatsapp to use this account android" when i try to login in WhatsApp using my number. I downloaded WhatsApp from official Play Store. I even tried downloading apk from official website and installing. I even formatted the phone and tried again. Still i am getting same results. I tried contacting WhatsApp support but they are saying to use official WhatsApp. If someone know how to resolve please help me out. 

Hello,

I am unable to log into my Facebook. It says that my password is wrong. I have tried resetting it many times and it never sends me the email with how to reset it. When I try resetting it from my mobile phone, the error message says, it's wrong.

I have also emailed Facebook for help!

Please help me!

Hello,

I'm Sameer Ali. I wrote my username and password, then Facebook is notified me "you trying too often, please try again later." Please solve my problem please why it's not open?

i cant log in i try to login and error is “unable to authorize “ then i try to log in on google and it work pls help.

Hello,

Hello Facebook team
Sir my personal account has been disable I'm a real person this is my real account and I have my personal data in this account I'm sending my data please check it and open my facebook account.
Facebook Name ****
E-mail :- ***@***
Number- ****
Date of birth :- 30/05/1994.

We received your information
If we still find that you're not old enough to be on Facebook, your account will remain disabled. This is because your account doesn't follow our Terms of Service.

We're always looking out for the security of people on Facebook, so until then you can't use your account.