VODACOM Contract extended without Client Knowledge

I have contract which I took with vodacom for iphone 6 in 2018 August. this is suppose to end this year August and I dont aim to continue with the contract. i took time to visit an outlet in December 2019 and I was told I took an upgrade and that my contract has been extended. on closer look then it was said infact my contract will end in 2022. then rectract to say oh we can see you had taken the contract in 2018. a ticket was opened to reverse the mistake with accounts, and I requested the query number , I was told its in the memo line someone will look it. went again last month to check if this was corrected. guess what it was not. another ticked and long call to unhelpful contact people opened. still this is not resolved....