Where in Vancouver can I lodge a complaint against a dirty restaurant? What gov't department can I write to?

I went to a restaurant in Richmond Centre a few days ago and the waiter there was extremely dirty. He had a very big sneeze and he sneezed to his hands and then served food to customers without washing his hands. He also kept on coughing slighting without covering his mouth. Before replacing customers' dishes, he touched the whole plates with his dirty hands (don't know for what purpose, as if he's clearing the germs on his hands to the plates!). My husband and I think it really disgusting! What a coincidence that after this meal my husband and I got a cold, not sure if we get it from that waiter. Now I really want to lodge a complaint against the restaurant!