Message me. I might just be able to help you get payment. If possible, before 6 PM, since I'm free at the moment.
DO NOT AWARD THIS PROJECT.
It's unfortunate that you had this experience, and I appreciate your informing the public about it. However, the way to inform Freelancer and have action taken is by reporting Tandra.
You will have to visit her profile and click on 'Report User'. Next, you'll have to select why you're reporting her. Report her on the following grounds:
1. They are attempting to take payment offsite
2. Their behaviour is inappropriate or abusive
3. Other
Also, is this person a man or a woman? If his gmail ID gave you any idea that it's a man, also report him on the grounds that "They are posting misleading or fake profile information", because Tandra is a female name, and they've provided no photo. Please explain that clearly.
If you feel like it, you can also email Freelancer and attach screenshots of your conversation. Show them the ENTIRE conversation - on Freelancer and outside. This might save you from fines and a potential ban. Note, however, that you won't get paid unless Tandra decides to do so. Since it's off-site, it's entirely up to him/her.
Then write in short what exactly they did. Mention that you are new to this site, and that THEY asked you to work outside Freelancer.
Also leave this project up for as long as you can. People need to know. Don't award anyone.
Hope that helps.