The text message said that you have successfully subscribed to the electricity bill and arrears notice, but I didn't subscribe myself. Why?

It may be a service provided by electricity (generally telling you how much electricity is charged in the current month and how much you owe, and paying electricity in the business hall will not be directly remitted to which account), or it may be a scam message (telling you how much you owe and remit to which account, which is generally a scam). You can call 95598 or consult the electric power business hall, and you will know the truth.