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Review your contract for any sort of termination or cancellation language. If there is some, then you can terminate in accordance with that language. If not, then you can still terminate for breach of contract by poor performance. If he sues, you can countersue (counterclaim) him for fraud and breach of contract.
Just wanted to be sure. You would be surprised how many people do not bother to read their contracts. You can do a preemptive suit seeking them to stop working and any money you have paid be refunded. Generally with construction contracts you should be able to terminate for poor performance.
I'd be happy to talk via phone (though there are additional charges) because maybe I'm missing something about what you are asking. I actually practice in Texas. If you are not happy with my feedback, I do not mind opting out so another expert can be of assistance.