Can someone collect on a bill if you never actually hired their company?

Question Details: I asked a friend for help putting up a fence. We agreed that most of the labor would be barter for materials I had. He agreed to charge only labor for workers he was going to have help, not himself. It took 2 months to complete a 330' fence, with him only coming out to help 4 times. At random times when it was convenient for him. Never did he give me any actual amount this help would cost. Then, 7 months later, he showed up at my gate at 9:30 pm and handed me a homemade bill, alleging that I owed him $2,000. I did not agree to the bill. Now his wife is trying to collect money from me saying I hired her company to perform the work, when at no such time did I ever hire her company. I would just like to know where do I stand and what can I do?

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