Telkom billing enquiry

In actual fact they do not deserve the one star. Firstly I am paying for 2 contracts that provide 10 gigs (Telkom Data) every month, the one I use for myself on cellphone *** the network never works. However the only reason I continue paying for the sim card that I don't is that the secondary card on number *** works fine for the person using the sim card. My issue then comes when I manually paid for the February 2021 bill on the 25th of Feb 2021 which is the bill date and receive an invoice today stating that Telkom will be charging me an additional R200 for the bounced debit for February 2021. I would like to know why that is? Is that fair? If Telkom deems it is fair for me to pay that please advise on how to cancel these sim cards as I am not prepared to be ****** blind. I have tried to contact the contact centre regarding this query however the voice prompt keeps referring me to the WhatsApp chat line...I want to speak to the consultant telephonically so I can get an explanation and as previously advised my Telkom sim card does not work at all. My contact number is *** Ande Nzimande Telkom reference number ***-