- I still have a mortgage on a property but don't live there so the mortgage bill gets sent to a different address (b/c rental property)
- Company A originated the mortgage and sells it to Company B
- Company B completely ignores the mailing address and starts sending bills to the original property address
- only through blind luck did I realize that the mortgage bill was being unpaid
This seems like basic, basic bookkeeping but I guess it's also a reminder that "reality has more detail than people realize" and that there are plenty of opportunities for improving systems.