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As others said. You should never build on their servers unless they pre-pay. I would use something like clients.YOURDOMAINNAME.com/clientname or something similar so they can preview the work. After it's all completed, PAID FOR and approved. Then move it over to their server(s). It a little more work but a great way to prevent them from taking what you build.
You could always try to contact their ISP and report them or something. I would stay away from any type of backdoor. I know a developer that got sued for having a backdoor and almost lost his business over this. I believe it's illegal to build in a backdoor to a system you do not own or the client have full disclosure of the backdoor.
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