You can add country switcher anywhere on your page using a shortcode [wcj_country_select_drop_down_list]. It will show up anywhere where you write it.

To add flags you should go to the “Prices and Currencies by Country” module settings and enable “Add Countries Flags Images to Select Drop-Down Box” option.

On the same page you can disable geolocating by changing “Customer Country Detection Method” option value.

Please make sure that your customers use the country switcher ([wcj_country_select_drop_down_list] shortcode or “Booster: Country Switcher” widget) and not the currency switcher as they are two separate modules. This may be a primary cause for the issues you have been experiencing.