Account arrears notifications

I've received the following email from NCUBEIC: Your Mbombela Municipality account has been handed over to Ncube Attorneys for legal action, Kindly note that you are required to settle your account within 7 days of receipt of this notice to avoid a possibility of further legal action or having your services terminated. I've paid the account but when I checked the account number I found out it wasn't my account. I'd given them the correct number and asked them to transfer it to my account number but no feedback.