Singh Transport of Brampton ON has not been paid by CH Freight Brokers of Buffalo NY within the 15 days upon delivery to customer (Big Company New York City), in fact, 30 days has now elapsed and still no payment. CH owes Singh $4000 CAD. In the meantime, CH has contracted with Singh to move a load of maple syrup to Johnny's Maple Company in Vermont, USA. Can Singh hold the shipment as leverage to get paid by CH?