$i = 5;
        while ($fila = $total->fetch_array()) {
            $objPHPExcel->setActiveSheetIndex(0)
                    ->setCellValue('A'.$i,  $fila['gasto'])
                    ->setCellValue('B'.$i,  $fila['lunes'])

                    ->setCellValue('Q'.$i, utf8_encode($fila['factura']));
                    $i++;
        }