Experience in electricity payment by ABC Online Bank

Enter a customer ID and a region ID during registration. The customer number is okay. We can see it on the power bill, but what is the region number?
Look at help, but what are the idiots that help write? Click the query button to start querying. Click the cancel button to cancel this operation.

I don't know whether the people who wrote the help thought about the user's feelings. There is no explanation for such an important "region number". Google did not find any help from the ABC website. Finally, call 955xx to get an answer from the customer service. If you encounter the same problem in Hangzhou, you can use this number to try: 335100.

After so many years of software, I feel as an idiot after using the ABC system.