Netstar - No Customer Care

For the past few months I have tried calling Netstar to inform them that my bank details have changed. No one ever answers in their customer care! I then receive an email from Creditworx informing me that my account was handed over. I then found an email with a link to the Netstar customer portal. I logged in, changed my account details, found my Netstar account number and did and EFT. I have since sent three emails to Netstar and Creditworx informing them of this and attached the proof of payment. To date I have not received any response from Netstar. I just keep getting emails from Creditworx informing me of my outstanding balance. Yet this is now settled!