Vodacom Call Centre Agents are offering very BAD SERVICE. Who can I talk to?

I am sick and tired of Vodacom. My data contract ended on the 29 November 2021. I called Vodacom Cancellations / Retentions approximately 6 times from Sept, Oct, Nov and Dec 2020 to cancel this contract. Right up until 23 December I spoke to Juliette Mthethwa who took my details and referred me to Cancellations. Vodacom still took R108.00 from my account which i consequently reversed. I spoke to a kind lady named Sandra who said that previous Vodacom personal did not set the cancellation of the debit order. She said she will do it. Problem would be resolved. On the 15 January 2021 I see Vodacom taking R316.00 from account. Which I again consequently reversed. This morning I called Vodacom spoke to Lucky - He as usual took my details referred me to Retentions - l spoke to a ultra soft spoken lady - She said her name was Matsatse. While telling her I could not hear her - i was cut off - and sent directly to rate this call to which i gave a bid fat 0 - I have had the phone slammed on me by Vodacom call centre agents so many times it is become unbearable. Can somebody please help me. However Lucky did take my cell number to check on me after I explained to him the poor service I was witnessing with my cancellation