Please help to make SOAP call using nusoap

Code:
$arik='

<GetProductListRequest>

<Filters>

<Filter>

<Name>Language</Name>

<Value>lt-lt</Value>

</Filter>

<Filter>

<Name>Currency</Name>

<Value>LTL</Value>

</Filter>

</Filters>

</GetProductListRequest>

';











              $this->load->library('SimpleXml');









                $my_data = $this->simplexml->xml_parse($arik);







              //print_r($my_data);









             $params=array('GetProductListRequest' =>array('filters'=>array(array('Name'=>'Language','Value'=>'lt-lt'),array('Name'=>'Currency','Value'=>'LTL'))));



            $params=array(array('GetProductListRequest'=>$my_data)) ;





               $req=array($params);







// print_r($req);



             $member = $client->call(

                    'GetProductList',

                    $params

                );