WCF SOAP Response Namespace Issue - wcf

Question

WCF returns empty objects, although I can see from a fiddler trace that data is being returned. I am sure it is namespace issue, but after reading all the docs I can't see what is wrong! Request and response SOAP below:
Request:
POST https://x.x.x.x:9001/soap/ HTTP/1.1
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; MS Web Services Client Protocol 4.0.30319.34209)
VsDebuggerCausalityData: uIDPo0Xy/aB8aeVEhMD2Z4yiT1MAAAAAKokUeOFUmEaRRFeDK7Ihn37dui0ez7tEhWItLBqEHq0ACQAA
Content-Type: text/xml; charset=utf-8
SOAPAction: "get_wsdl_version"
Host: x.x.x.x:9001
Content-Length: 236
Expect: 100-continue
Connection: Keep-Alive
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body />
</soap:Envelope>
Response:
HTTP/1.1 200 OK
Date: Thu, 05 Feb 2015 10:10:18 GMT
Server: Apache
Vary: Accept-Encoding,User-Agent
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/xml
<SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Body>
<get_wsdl_versionResponse>
<get_wsdl_versionResult xsi:type="xs:int">2002</get_wsdl_versionResult>
</get_wsdl_versionResponse>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Edit: adding (very simple) client code
Dim TestClient = New ServiceReference1.TableLampServiceClient
Dim Creds = New ServiceReference1.AuthInfo()
Creds.username = "xxx"
Creds.password = "yyy"
Dim TestVersion = TestClient.get_wsdl_version()
Edit: adding WDSL snippet - pulled from VS
<?xml version="1.0" encoding="utf-8"?>
<definitions xmlns:tns="cust_service.TableLampService" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance" xmlns:plnk="http://schemas.xmlsoap.org/ws/2003/05/partner-link/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:typens="cust_service.TableLampService" name="TableLampService" targetNamespace="cust_service.TableLampService" xmlns="http://schemas.xmlsoap.org/wsdl/">
<plnk:partnerLinkType name="TableLampService">
<plnk:role name="TableLampService">
<plnk:portType name="tns:TableLampService" />
</plnk:role>
</plnk:partnerLinkType>
<types>
<xs:schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="cust_service.TableLampService">
<xs:element name="get_wsdl_versionResponse" type="typens:get_wsdl_versionResponse" />
<xs:complexType name="get_wsdl_versionResponse">
<xs:sequence>
<xs:element name="get_wsdl_versionResult" type="xs:int" />
</xs:sequence>
</xs:complexType>
</xs:schema>
</types>
<message name="get_wsdl_version" />
<message name="get_wsdl_versionResponse">
<part name="get_wsdl_versionResponse" element="typens:get_wsdl_versionResponse" />
</message>
<portType name="TableLampService">
<operation name="get_wsdl_version" parameterOrder="get_wsdl_version">
<documentation>
get_wsdl_version() -> int
Return the SOAP server's WSDL version. This is used to check
client/server compatibility.
Parameters: None
Exceptions: None
</documentation>
<input name="get_wsdl_version" message="typens:get_wsdl_version" />
<output name="get_wsdl_versionResponse" message="typens:get_wsdl_versionResponse" />
</operation>
</portType>
<binding name="TableLampService" type="typens:TableLampService">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http" />
<operation name="get_wsdl_version">
<soap:operation soapAction="get_wsdl_version" style="document" />
<input name="get_wsdl_version">
<soap:body use="literal" />
</input>
<output name="get_wsdl_versionResponse">
<soap:body use="literal" />
</output>
</operation>
</binding>
</definitions>
It may be worth mentioning that I have no control over the server-side. I just need to consume the service in my code however I can.
Thanks in advance!