Not updating settled account with ITC

I am so disappointed in Vodacom. After I settled my bill in January of this year, my account still appears to be open and active with ITC SEVEN MONTHS LATER! I called them multiple times and they told me that I myself must call each ITC to close account. How ridiculous is this? I’ve been given the absolute run around. My credit score is so negatively affected. I have kept to my part of the settlement it is only fair that Vodacom does the same! Please someone contact me ASAP to resolve this