Vodacom and their continuous bad service!!

Vodacom is continuously providing Bad service to its customers . I called their terminations department 5 times last year (2018) to cancel my contract and to date 28/01/2019 the contract is still active and they are still debiting my bank account. This is really horrible service to a loyal customer that has been a contract subscriber with the network since 2015. Every Vodacom call centre agent that I have spoken to advised that the contract will be closed and I will no longer be debited. But no, on the 25th of January 2019 my account is still being debited for a contract that I stopped using over a year ago. Can a competent Vodacom employee please assist me and close this contract !!??