No responce from Vodacom

My contract with vodacom ended 25/09/2023. I then was on a month to month contract. They added exstra data that i did not asked for. I visited the vodacom store next to Game in Kollonade the beginning of this year. The lady said that i will only pay R400 and something a month, however that did not happen. On 7 April 2024 i went back and the lady said that I was paying for extra data, I never asked for exta date, gave me a number to cancel. I received a new account without the added data. On Monday 8 April 2024 called the number and received an SMS that the they will send an email. Did the same 9 April Tuesday 2024 the same result. Went in Yesterday 12 April 2024 to the Vodacom shop on the upper level of Kollonade. The person tried to help me, even took my phone and called the number twice but was disconnected everytime. Received again the SMS they will send Email . Until such time, contract is not cancelled. And the message: You are eligible to upgrade. I want to cancel my month to month contract with vodacom. Help me!