My question involves business law in the state of: California
The company that I work for provides printing services. Customers on account receive invoices with every transaction and are sent a statement of all services at the end the month, which they are expected to pay within 30 days.
One of our customers, who owes us several hundred dollars, has changed their address and won't return phone calls. They received several statements before changing their information, so we know that they know they owe us.
How do I contact them and how should I proceed with this issue? Any insight would be greatly appreciated.
Thanks you!

