How to turn off SMS reminder of electricity bill in Beijing

I have often received electricity bills from other people's homes in the last two months, which is very annoying. In the last two months, I have often received other people's electricity bills, so you can ask the mobile operator why other people's short messages are sent to your mobile phone number. This may be because the person who paid the electricity bill used your mobile phone number before and returned it, so his original contact information will still be sent to this number. You can ask the mobile operator to close this message, or you can send this short message for blackmail.