Vodacom wont cancel my contract

I have been trying to cancel my contract, which finished in December 2022, since November 2021. I had to give 30 days notice which i did. I spoke to an agent who assured me it was cancelled and i wouldnt be billed again. Needless to say, I was billed in January.

So i contacted vodacom and asked to once again cancel my contract after I paid again. This has happened now another 3 times. I still havent been able to cancel because they keep doing the same thing over and over. Its basic theft. Nobody can help. All they do is take money and not help.