Vodacom contract

I took contract with vodacom for Huawei y3 2018gold, date was 2018/11/06. So last year my contract was due to end vodacom starting advice me to upgrade my contract several times and I told them time and again I'm not interested, so two weeks ago someone called me from vodacom to upgrade my phone contract, then I told him I'm not interested my contract ended last year. He starts to say that I'm in errors of R400 something. Then I told him this is ***** my contract ended last year, then he said sorry my mistake you due to upgrade. Friday morning I went to my bank to check my account deductions last from vodacom was December 2020, at the same time I went to vodacom shop at carnival mall. I found salesman with luck of help, I started my details then I asked why vodacom is deducted on my account because I signed up a contract of 24 months but they busy putting airtime to the some contract number ***. So according to vodacom we must sign up 24 months contract after that 24 they must ***** us by sending airtime to the same contact number to claim errors to people, then salesman from vodacom shop failed to provide help and gave me that I must phone to stop the account was 082 samething. When I phone that number Sametime the sales person with poor customer service he told me they can't close my account if I don't pay errors. So that means I pay for airtime I nevertheless asked. The other thing I'm no longer using that phone including Sim card my x girlfriend is using that phone.