How to set default telephone country code to South Africa in user profile

[grokbookings.com]

Hi I tried the recommended snippet without result please assist

add_filter( ‘hivepress/v1/models/listing/attributes’, ‘custom_hp_set_countries’, 1000 );
add_filter( ‘hivepress/v1/models/vendor/attributes’, ‘custom_hp_set_countries’, 1000 );

function custom_hp_set_countries($attributes){
if(isset($attributes[‘whatsapp’])){
$attributes[‘whatsapp’][‘edit_field’][‘country’] = ‘South Africa’;
}

return $attributes;
}