KSoap2 is not returning valid xml?

I am trying to get an xml data from web service. The xml data is like this

<Result>
<ErrorCode>0</ErrorCode>
<ErrorMessage>Login was succesful.</ErrorMessage>
<AuthCode>maneen90234</AuthCode>
</Result>

But what i am getting from KSoap 2 is the following String

anyType{Result=anyType{ErrorCode=1; ErrorMessage=Incorrect Username or Password; };

These is how I am calling web service

private String callAPI(String user, String password) {
        request = new SoapObject(NAME_SPACE, "UserLogin");
        PropertyInfo pi = new PropertyInfo();
        addProperty(pi, request, "UserId", user, String.class);
        addProperty(pi, request, "Password", password, String.class);
        envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
        envelope.dotNet = true;

        envelope.setOutputSoapObject(request);

        androidHttpTransport = new HttpTransportSE(url);

        try {
            androidHttpTransport.call(SOAP_ACTION, envelope);
            response = envelope.getResponse().toString();
        } catch (Exception exception) {
            response = exception.toString();

        }
        return response;
    }

    private void addProperty(PropertyInfo pi, SoapObject request, String UserId, String value, Object type) {
        pi = new PropertyInfo();
        pi.setName(UserId);
        pi.setValue(value);
        pi.setType(type);
        request.addProperty(pi);
    }

I have tried various answers available on SO, to no avail. Any idea what am I doing wrong here?