Default listed

I don't know if any of you have tried to cancel a Telkom account, but it is impossible and comes with financial repercussions. I cancelled my account with Telkom in September 2015, filled a form and sent it to ********** as per process. They continued sending me bills after that till January 2016. I queried this with the call centre, the Mall of Africa branch and on email without any joy. Next I was harassed by their debt collectors Blake and associates, Nu debt, P&P associates. I explained to all of them the process I followed and provided proof of my interaction with Telkom about my cancellation. I have come to know today when I tried to get a new cell phone contract that one of them listed me for a default on instruction from Telkom. If I don't hear from Telkom in the next 48hrs, I'm going to lodge a complaint with the Credit Ombud because I'm going to make a financial loss by missing out on savings I would have made on taking out a contract today.