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Why would you start working if the client didn't hire you? It doesn't matter what they say in the messages, if you're not hired, then they don't have to pay you anything.
How are you? Were you hired? Did your client sent you an offer and after that did you accepted it? By your words, it looks like you are not currently working on a contract & working for free. You should have to get yourself hired first and then start working on the work which he requires.
Hope it clears your mind...!!!