Bad service ever

I have settled my contract on the 30th November 2023 I've paid them settlement balance of 1402 as I called to check how much I owe them and closed my account, Telkom even closed my sim card without letting me know, when I called to find out about my sim card being suspended and closed they advised me to visit the branch and re open my sim, I've been to protea Glen mall and spoke to 1 of the consultant there she then advised me that, they will never re open my sim again they canceled it together with my contract, then I gave up on my sim and bored new sim card, so now I have a new problem from them they still deducting instament for the very month data and airtime for sim card that I no longer have and I'm being over charged in my cheque account for unpaid transactions they cause, I went to Glen mall again to find out why are they still continue to debit me yet they advised me they don't know, I even called their customer service to find out they advised me about the billing which happened after I have settled the contact.so all I need from telkom is to return back all the intrest they caused in my account and stop debiting me something I do not assign for.