Facebook Sync notification on Xpoeria Mini?

[SIOF]

I own a Sony Ericsson Xperia Mini. I have a notification which is constantly displayed saying that the phone couldn't synchronise Facebook. It informs me to please log in again. Despite this i can still access Facebook perfectly well. When i click into the notification it warns me that I am responsible for charges incurred as a result of data transmission. I am wondering if this is a scam or if it genuine enough and additionally how do i get rid of this notification.

[R4U]

uninstall and reinstall the facebook app from the plays store