Can I please cancel my account!!!!!

We had a fibre account with Nepic, who we were happy with but subsequently sold their customer base to Supersonicfibre. To say that I am not happy with the level of service I have received since Supersonic took over is the biggest understatement of the century! To put it in perspective,I have been trying, without success, to cancel my account. I have sent through an email requesting info on cancelling. I have even sent an email asking to please cancel, no info needed I just want to end things. No response. I Whatsapp-ed, as advised, and got a 'sorry we cant help you' in return. Finally, after sitting on hold for 20 minutes on the call center number, I finally got through to expressionless voice, who informed me that within the next 30 days after attempting to cancel my account, someone might call me back to confirm my outstanding fees. As I never signed up with Supersonic myself, but am the ugly step child that was sold off to them, I have no idea what these outstanding fees could possibly be and no one, not even expressionless voice, could tell me. Please, if anyone is reading this, don't sell your soul to these people. You will forfeit all patience and sanity!