[CORE] Prevent Core update

Hi,

since beginning of investigation on webiste’s client, i have removed/edited

? wp-config
standard line about prevent or add automoatic update to restore standard control

define( 'WP_AUTO_UPDATE_CORE', false );
seems not work

? functions.php

add_filter( 'allow_dev_auto_core_updates', '__return_false' );
add_filter( 'auto_update_plugin', '__return_false' );
add_filter( 'auto_update_theme', '__return_false' );
remove_action('wp_head', 'wp_generator');

seems not work

? try 2 or 3 plugins
Last plugin keep wordpress safe 2 days and finally got 4.5.2 update

"Update Control"
seems not work

SERVER
Site are on VPS, CentOS + Plek lastest build but seems not integrate any stuff about auto update…

Then, does anybody have an idea or clue because, this @##!! website make me crazy and i m lastest freelance who worked on this, then seems to be my work to solve this issue.

Cheers