error adding feed in woocommerce checkout

Well, I'm adding a new feed to the checkout in woocommerce, now it adds it when I put the value manually but when I add the real value it puts it in zero, part of the code:

function llamar($total_pagar,$acum_empas)
    $v["precio_total"]=$total_pagar;
    $v["acumulador_empasta"]=$acum_empas;
    do_action( 'woocommerce_cart_calculate_fees', $v );
}


add_action( 'woocommerce_cart_calculate_fees','endo_handling_fee', 10, 1); 
function endo_handling_fee($valores) {   
    $precio_total=0;
    $precio_empas=0;
    static $cont = 0;
    static $ent=0;
    foreach ($valores as $key => $value) 
    {  
        if (strcmp($key, "precio_total")==0)
        {
            $precio_total=$value;
            $ent++;
        }
        if (strcmp($key, "acumulador_empasta")==0)
        {
            $precio_empas=$value;
            $ent++;
        }
    }
    //echo $cont."-_-".$precio_empas;
    $cont++;
    {
        $fee = floatval($precio_empas); 
        $fee = 5.0; 
        global $woocommerce;
        if ( is_admin() && ! defined( 'DOING_AJAX' ) )           
            return;

        $woocommerce->cart->add_fee( 'Empastado: ', $cont, true, 'standard' ); 
        echo $cont."-_-_".$precio_empas;
    }
}

the code like this one is saved 5 without any problem, but when I save $eprecio_empas it saves the value of 0, $precio_empas has a value because I can visualize it in: echo $cont."--".$precio_empas ;

that counter I put it to know if I was not overwriting, calling again to the action but I detected that it enters twice, once from the call when loading the page and another with the do_action( 'woocommerce_cart_calculate_fees', $v ); but although the second time it enters it does not write the value. what I did was to create a function that loads woocommerce_cart_calculate_fees once.

function llamar($total_pagar,$acum_empas)
    {
        $v["precio_total"]=$total_pagar;
        $v["acumulador_empasta"]=$acum_empas;
        llamado($v);
    }


    function llamado($v)
    {
        add_action( 'woocommerce_cart_calculate_fees','endo_handling_fee', 10, 1); 
        do_action( 'woocommerce_cart_calculate_fees', $v );
    }


    function endo_handling_fee($valores) {   
        $precio_total=0;
        $precio_empas=0;
        static $cont = 0;
        static $ent=0;
        foreach ($valores as $key => $value) 
        {  
            if (strcmp($key, "precio_total")==0)
            {
                $precio_total=$value;
                $ent++;
            }
            if (strcmp($key, "acumulador_empasta")==0)
            {
                $precio_empas=$value;
                $ent++;
            }
        }
        //echo $cont."-_-".$precio_empas;
        $cont++;
        {
            $fee = floatval($precio_empas); 
            $fee = 5.0; 
            global $woocommerce;
            //if ( is_admin() && ! defined( 'DOING_AJAX' ) )           
               // return;

            $woocommerce->cart->add_fee( 'Empastado: ', $cont, true, 'standard' ); 
            echo $cont."-_-_".$precio_empas;
        }
    }

I know that the function enters endo_handling_fee with the do_action but I don't know why it doesn't store the value with $woocommerce->cart->add_fee( 'Filling: ', $cont, true, 'standard' );

Thank you