Unreasonable billing

The worse service I have ever experienced in my life. I had to pay for 45 days of internet connection without any connection. The excuse was that Vox is not responsible for the internet- Vumatel is responsible but Vox received the money. When I cancelled my contract due to the bad service I also cancelled my contract for a power bank. I was sold this power bank by one of their agents over a years repayment. Then I was told I had rented it so I cancelled it. Was told it would be picked up on the 30th April. Was called twice after that and told someone would pick it up and they would call me with a date and time. Six months later I receive a bill for over R600 and a request to courier the item to them at my expense.