Everything from “For Property Owners and Managers” also applies to billing companies. You also have the added responsibility to keep in contact with your properties to verify they are doing what is recommended in the linked page, as well as track tenant complaints and take them seriously.
I know it is common practice to discount complaints, but you must follow up with them.
Dont be one of billing companies that are featured here as lazy and uncaring. Be Proactive. Be Alert.