He is exercising what is known as a possession lien on the property to secure the payment of the money you owe him. Even though this particular shipment may be paid for, if you owe them money then under common law he can exercise a lien by holding the property until you pay him for whatever you owe him.
Prank calling is telephone harassment and you can file a complaint against him with the police in AZ, since that is where the harassing telecommunications are coming from. You could also sue him in AZ for interfering with your business
by tying up your business phones with their prank calls as long as you can prove it is him or his company making these harassing calls.
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