Cancelled Fibre Account Still Charged & No Settlement Letter

I am extremely disappointed with Vodacom’s service. I cancelled my month to month uncapped fibre account back in May, yet I was still charged for months after cancellation. To make matters worse, the fibre stopped working in May and Vodacom could not fix it, but they continued billing me regardless. I eventually paid the outstanding amount because I want to repair my credit score, but now Vodacom is refusing to assist me with a settlement letter and proof of account closure. I have called numerous times with no resolution, and the consultants I have dealt with have been rude and dismissive. How is it fair to pay for a service that was no longer working, only to be denied proper documentation afterwards? I am exhausted from dealing with this company and deeply disappointed by their lack of accountability.