Hi, I do not know how to resolve issue with extension in wsdl

this is part of wsdl

<complexType name="Contact">
  <annotation>
   <documentation>...</documentation>
  </annotation>
<complexContent>
<extension base="tns:BaseContact">
 <sequence>
  <element maxOccurs="1" minOccurs="0" name="id" type="xsd:long">
    <annotation>
     <documentation>...</documentation>
    </annotation>
  </element>
  <element maxOccurs="1" minOccurs="0" name="name" type="xsd:string">
    <annotation>
      <documentation>...</documentation>
    </annotation>
  </element>
.......

 salesforce wsdl2sfdc generate

public class Contact{
public String name;
private String[] name_type_info = new String[]{'name','https://....',null,'0','1','false'};
...
}

and 
public class BaseContact {
        public String BaseContact_Type;
        private String[] BaseContact_Type_type_info = new String[]{'BaseContact.Type','https://...',null,'0','1','false'};
        private String[] apex_schema_type_info = new String[]{'...','true','false'};
        private String[] field_order_type_info = new String[]{'BaseContact_Type'};
    }

 but it doesn't work, when I receive response form web service. Error message:

Web service callout failed: Unable to parse callout response. Apex type not found for element BaseContact.Type

Please, can anyone help me? I read some articles and tried many combinations, but it have not help me.

Do you have some documentation how to manualy write apex class from wsdl?