Hi,
did you already get some reply? I made complain in New Delhi. First stage of complain is that you have to directly contact manager of branch. I did it through the e-mail and I got reply second day by e-mail. You should call to branch and ask for the contact to manager. When I was calling to Delhi they actually did not want to give me this name and I had some discussion withe them. Your CO will of course know that you complained. If you still did not get any reply, seems your fax was somewhere lost.
Good luck!
F