manipulate data from user in checkout page

So I want to catch the data that the user is filling in the checkout form,
for example first_name, billing address and to make some manipulation on it. I tried this code, but nothing is happening! and I do not understand why is that.

function my_checkout_update_user_meta( $user_id ) {
if(pll_current_language() == ‘he’)
{
$first_name_input = $_POST[‘billing_first_name’];
$billing_company_input = $_POST[‘billing_company’];
update_user_meta( $user_id, ‘billing_address_2’, $billing_company_input );
update_user_meta( $user_id, ‘billing_company’, $first_name_input );
}
}
add_action( ‘woocommerce_checkout_update_user_meta’, ‘my_checkout_update_user_meta’ );

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