Incompetence

I have been a contract client with vodacom for over 7years now. My challenge is that everytime i want to cancel a 24 month contract, they dont cancel it. In July 2020 one of my vodacom contracts was due for an upgrate so i called them requesting cancellation. I was informed it would be cancelled by end of July. On 15 August vodacom debited the full amount for the cancelled contract. I called again and was informed that my complaint would be escalated and i would recieve a refund. Nothing till date. Reference number: ***. Agent: RW_REDDR 001. I had the same problem last year with another contract that i had cancelled but vodacom decided on their own to put my number on month to month basis. Vodacom refuses to cancel contracts and im so tired of the way they treat clients. I have decided to seek legal advise