Supersonic continues with giving no client service.

I installed fiber in July 2020 and cancelled by contract with Supersonic on 31/08/2020, with effect end of September 2020, thereby giving 30 days notice. Regardless they still took debit orders for my 2 contracts in October and November and ever since it has been a massive problem getting my refund. The credit note was send to me on 16 November but still no refund. Whenever I phone them ( 4 times this week already) I get the same reply saying I can't speak to a manager but they will phone me back within the next 30 minutes. This week I spoke to Marsha, Keith Solepe, and 2 other consultants. A person with the name Clara would have phoned me back yesterday, but didn't. The manager, Goodenough, was suppose to call me back today, but again didn't. Supersonic used to operate as Nepic and they were brilliant but now the company gives pathetic service and lying to customers are their go to response. If I could give a zero star rating I would have.