make_headers(Content-Type => 'text/xml', SOAPAction => ""http://bwcg.h
+k/Services"")
[download]

Are you sure this is the code you're using? (it doesn't even compile)  Maybe you could try

make_headers('Content-Type' => 'text/xml', SOAPAction => '"http://bwcg
+.hk/Services"');
[download]

Or, try specifying the double quotes as %22 (URI encoding), or " (entity encoding).  This is just a guess, though — from the top of my head, I can't tell what's expected in an HTTP/SOAP header...

Update: just checked it: there doesn't seem to be any general problem with double quotes in HTTP headers — though I'm not sure what further processing the SOAP backend is applying to the value...