Hi Pilgrim, Thank you for taking the time to reach out to us.
It is a rare scenario for two energy providers to have the billing rights for the same property address, however, we do have measures in place to investigate this for you.
As your previous provider is sending you disconnection notices, they might still incorrectly have the billing rights and we would recommend contacting them to ensure they have not raised any disconnections until we raise the investigation.
I'll send you a private message so we can get some details from you and assist you further.
Kind Regards,
Natalie