Poor Service and Billed R1999 for a 2nd hand free to use router

I decided to cancel my internet service (100gb data) with Webafrica, only to be called by an agent and persuaded to downgrade to a cheaper 20gb option (which I am happy with) and the agent promises that I will not be billed twice due to the 30 day notice my 100gb account will be cancelled immediately. A "free to use" router was sent to me again, although I already had one in my posses ion. I find out that I will be billed twice and log a ticket to question this and inform them about the router, asking for the return address and stating that I will not pay for the router. The ticket is resolved without any acknowledgement regarding the router. Time goes by and I am billed R1999 for the router. I logged another ticket to question this, only to receive no response, yet my credit card is repeatedly debited (insufficient funds) and now I am threatened with account suspension. What kind of service is this? You did not even warn me as that you did not receive the router as stated on your website: "We will send you a reminder on day 10 if we have not yet received your router."

https://help.webafrica.co.za/support/solutions/articles/***-what-happens-if-i-choose-to-cancel- Knowing that I cancelled and was persuaded to downgrade due to affordability, why are you billing my credit card that does not have enough funds repeatedly without even acknowledging my 2 support tickets after a week? I have to pay a penalty for each failed debit.