PROBLEM with font awesome icons

[cievirtualp]

Hi, we are using Font Awesome icons in the latest version on our website, having installed the plugin https://wordpress.org/plugins/font-awesome/ for this.
The problem is that the mobile navigation menu icon (fa fa-bars) in your theme is from an older version and with the installation of the plugin to use the latest icons, it no longer appears.
Is there any way we can keep the most recent icons on our website and fix this problem with the icon not appearing?

Ticket