Unresolved bill shock query, bad service

Vodacom has been billing me for a Fibre line that I have canceled in October 2022 now we are in March 2023, i phoned the customer care and address the issue, they refer me to billing were I had to repeat myself then billing refers me to the Fibre department were I had to repeat the same issue 3 times to other departments in the Fibre call centre, eventually I managed to log a service request and was told to wait 48 business working hours, after waiting I get a email to say that it was a mistake and i will get credited for the Fibre charge and the Fibre account will be closed, today I checked my statement for March and found that I am still being billed for Fibre, this is not acceptable in which I as the customer has to be inconvenced,it's fustrating and irrelevant to be billed incorrectly and even more frustrating to keep on phoning Vodacom to fix this problem, the service is terrible, people from customer car to billing can't do their jobs, how do they pass training or do they ever go for training, the level of service is bad and I will never recommend Vodacom to any family and friends, I will finish up my contracts and close my account with them.