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Did you pay him any money? Does he operate under a corporation? How much was the total agreed price for the job?
You need to send him a certified mail letter with return receipt requested stating that it has been X number of days since he has left the yard encumbered and that you have not heard back from him despite many attempts to contact him. Further state that if he does not respond to you in writing (in say 5 days) as to his intentions about completing the project as agreed, you will consider his silence to be a repudiation of your contract and that you will hire someone else to either complete the project or remove the stones and bill him for any monetary losses that you incur.
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