Hi. Thank you for your email. I am sorry to hear about what happened to you on odesk platform. Freelance platforms like odesk carries risks such as not being always protected from clients who act the way your friend did. I don't think that customer service will be of any help to you in this situation. You may like to think of your options to retrieve your password On odesk so you can access your own profile and continue working with other clients. As for the charge that your friend owe you, there are attorneys who specialize in intellectual property. You may like to consiser a legal coconsultation. It is often provided for free.
Sorry about your loss of money. I can imagine how hard it can be to accept that. Take this as a lesson in life and in freelancing world. Perhaps you would also consider to open your own writing business.

Good luck with everything
Areen