My account stays in arrears as they kept on billing me

I have canceled my data contract last year 29 December 2023 Since then Vodacom charge me double payment every month. I have contacted them several times and emails was send I do have all the prove from the store where, I have **** payment. I emailed Vodacom Subscribers collection and they still calling me back. I have left many messages and still no response. I have left messages again and call vodacom. I have **** payment. Again my last month they charge more for my *** number which is a total R1400. I have had many bad experience and struggle with them for months.