NUDEBT no assistance at all !!!!!!!!

Have had NUDEBT on the phone and email trying to strong arm me into paying for a Telkom contract that was cancelled in January 2020 which I have stilled been billed for and they have not had any customer service to follow through or try resolve a blantent issue with the Telkom bill and when questioning them and stating that it was cancelled in January and sending through the proof as well as the cancellation payment fee and one month extra payment I am still been invoiced by Telkom to date and on top of it all it is for a different value I signed up for. I have been dealing with a Millicent Ndiya <***>and she has been nothing but not helpful , her last response was we have explained the cancellation process unsuccessfully to you !!!!! How does that assist getting this matter resolved ? There must be a law that protects the consumer from these ************ ????