Telkom - Do they really train the staff or are they all morans

I cancelled my fixed line when I moved from one city to a farm with no telephone lines. That was in December 2017. I had a very difficult time to get them to cancel my line and the debit order just carried on and on. I followed all protocol regarding the cancellation. Eventually the debit order seems to have been cancelled and it did not go off on month end February 2018. I thought thank heavens!!. Now I tried to open a account at a other firm, just to be declined! I checked my credit report and found that TELKOM has listed me as a BAD payer!!! I was never even one payment behind on my Telkom account! This could only be because the staff is not properly trained!! ?????