Pathetic and incorrect service and reporting by Vodacom SA

From about 2018 to 2020 I received numerous calls from debt collectors as well as Vodacom regarding an account with an outstanding amount of approximately R2500. Vodacom even sent my details to the Credit buro. After approximately 25 calls over the 24 month period whereby I informed that Vodacom in fact owed me and not vice versa the mentioned amount and was always informed that they would raise the issue to a higher level. Then one day, it was actually raised to a higher level and hallelujah, Vodacom realized that they actually owed me the mentioned amount. 25 months later and they still have not reimbursed me or rectified the faulty Credit buro issue. Is this a case of incompetence?