I have received a bill from your company in error. I received an invoice stating I owed $(amount). I do not have an account with (company) so this is obviously an error. I would appreciate your immediate attention to this matter.
Sincerely,
(your name)
Dear (recipient's name),
I have received a bill from your company in error. I received an invoice stating I owed $(amount). I do not have an account with (company) so this is obviously an error. I would appreciate your immediate attention to this matter.
Sincerely,
(your name)