Couldn't cancel Telkom contracts leads to bad Credit Record

I had two Contracts with Telkom, which I couldn't cancel. The first one I opened for myself in 2014 and the second one I opened in 2016 for myself. As soon as the contracts expired I requested for it to be cancelled. However Telkom told me that it could not be cancelled because neither of them has been in my name for more than a year. According to them I opened both of the contracts on the same date somewhere in Feb 2018. This has been an ongoing struggle all throughout last year, with me running upand down between the branch and phoning them constantly. So eventually I stopped paying them. The sorted this problem out much later, and cancelled both my contracts, but now I have a fee due to them that is close to R10 000 because of me not paying. This makes my credit record look extremely bad and I can't submit a case because I don't have a number that is registered with Telkom. Please Help