Poor customer service

I have been with Vodacom since year 2006 and I was happy with their services until the 26th September 2019. When I received a call from Vodacom. The gentleman’s name is Rian. He advised me that he is calling from Vodacom regarding the contract that I have with them. I was heaitant to discuss the account with him, so I advised him that I will visit the nearest Vodacom shop to enquire. He ensured me that he is calling from Vodacom and they are offering me 10 gb, not 2 gb anymore. He advised that it is not an upgrade and that I will still pay the same amount that I was paying for 2gb. He forced me to agree and advised that it is something that they are giving to all Vodacom customers. I agreed because he was forcing me to and I was at work and he was disturbing me. On 9th October 2019, I received a statement showing the outstanding balance of R630, 50. I called Vodacom and I spoke Akhona, who advised that I agreed to an upgrade. When I told about the call received on 26 September 2019, Akhona asured me that the upgrade will be cancelled on the same day. Today, I checked my account balance and I was informed that same is still R630, 50. Which means the upgrade has not been cancelled. I am very angry and I want all the voice recordings for the 26 September 2019 and for the 9th October 2019. I also want to cancel all my contracts with Vodacom today. There are so many service providers and I am sure that they can provide me a better services. Please call me urgently on *** urgently I need to cancel my contracts with you guys coz you are robbing me. Failing which I will report this