Facebook App won't delete

I downloaded the facebook app on my Pearl 81xx. I went on vacation to the Dominican Republic and got a whopping raoming data bill. Apparently it automatically connects to the net every 3 hours!! I went to Options - advanced options - applications and deleted it. However it is still on my phone. I have even done a battery pull! Im about to travel again and I dont want another roaming data shocker. Or is there setting I need to change in order to prevent the frequent connections

Go into Facebook options and change the auto update to "never". Then make sure when your away to never open Facebook. Also in the options, stop all notifications.

Thanks
I followed your instructions. Will know if it works on my next trip. Would still like to know why app cannot be deleted.