Billed for no service

My business was looted in June 2021 and all my electronics in my office was ******, I phoned telkom and asked for a new simcard and router, was promised that my account will be upgraded and a new Sim and router will be courierd to my office, this never took place and telkom kept on billing me, although I had no service. I stopped paying my monthly invoices to see if I could get any action from Telkom, but still no joy, telkom then handed my account over for debt collecting to a company called NEWDEBT, I explained my scenario to them and my account was then handed back to telkom to sort the mess out. TELKOM has now handed my account to DEBT IN, which after many explanations and paperwork is telling me that I am liable for the costs, because I should have canceled my account