SuperSonic Home Wifi service provider

I have had a very poor experience regarding accounts. Supersonic changed the banking details and I was not notified. I also did not check my statement regarding banking information changes from Capitec to Stand bank. Now after 5 months they are hounding me for outstanding payments. I have sent them all the proof of payments done and after month I get another notification of cancellation. What have they done to resolve this, they method off communication is via WhatsApp's which when you choose the options for ACCOUNTS the message says the site is under maintenance. Then the number that they provide to contact them also does not go anywhere. How can a business like this operate where their customers cannot even call them to resolve the issue. I am so frustrated with SuperSonic FTTP right now as after a month they are still not able to resolve anything. Surely payments made to Capitec can be traced and allocated. This banking details is where I have paid my account to since prior to Covid. Very dissappointed with the lack of human contact, meaning pickup a phone and call. OR at least provide a method where you can chat to someone in person in accounts.

Regards Mr Bhavin Naik.