I think you should mention canada revenue agency vs cash deals if he wants to start talking about a lien. This may be the classic "low ball to get the job then jack up the price" scenario. Before any more work is done I'd have a neutral third party contractor/inspector come take a look at the work that's already been done. You may end up kindly asking him to leave your property with $0 payment and a possible court case to cover the damages he caused.
Or he gets his $1800 and learns a valuable lesson on quoting jobs.
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