Hello, are you still able to access your login through facebook? What login password did you change? Is it the one for the account you are trying to login with?

As JustSaying had instructed, please make sure to retype the new password in slowly, to ensure you did not mess up, and also try to old password, in case it did not work. If neither of these works, you will need to contact CS via a ticket to get assistance.

https://support-center.oasgames.com/

https://support-center.oasgames.com/?lang=en-us

Try this link, see if it exists for you there.