Can I be sued by landscaper for wasp stings?

Question Details: I hired a company who I now realize may not be an actual company; it is uninsured, unlicensed, etc. I hired them to clean debris and till the yard on a home we just purchased but hadn't even moved in yet. When they started tilling, they hit an underground yellow jacket nest and he claims 3 guys were severely stung and went to urgent care. They came back out 3 days later to finish the job but never actually did and is now threatening to sue more for medical expenses and put a mechanic's lien on property there is a dispute on payment since I paid him in full but he took some of that payment as reimbursement for some of the medical expenses and is now saying I didn't pay him for the actual job. This whole situation is a mess and while I feel bad they were stung, I don't feel I was neglectful in any way nor should I have to pay but I'm new to home ownership so I don't know these things yet.Can they actually take our new home from us as they are claiming and sue us for tens of thousands in damages?

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