I lodged a complaint last month as netstar had the wrong banking details and didn't debit

I lodged a complaint last month as netstar had the wrong banking details and didn't debit. I send them confirmation and bank statement giving the correct details. This month again the didn't debit. I received an email yesterday saying they have confirmed my business account at netstar and will now debit monthly. It's not a business account as I have told them three times. Also ..when will the debit as it did not go off on the first must i do an EFT? Communication is very bad