Terrible service, Not updating ITC in time

I have settled my Cell C account which was ceded to Nimble Collection Services. The settlement was done over a month ago. The company had 7 working days to update my account with the credit bureaux but that never happed. I called in today to find out why was that, no one was giving me an answer and they kept on dropping my calls whenever i called. What finished me was when i called and someone picked up the phone and said nothing for over 5 minutes until i hang up. I kept on saying "hello? hello?" and i could hear them breathe and move in the background.

Then i called and requested to speak to a manager, they told me they will escalate. But no one called me back to give me an explanation. I went to their website and used a chatbot to try and sort this out. I sent the message at 15:01, no rep**** for over 2 hours and the reply i received at 17:13 was "we have not heard from you in a while so we'll be ending the chat" Im like, how can you end the chat when you havent answered me. This company truly does not deserve to trade as it does not serve the customers best interest.