Vodacom is the worst network service ever!!!!

I cancelled my cellphone account with vodacom on the 22nd of April 2020 and they confirmed that my account was cancelled and the call was recorded..funny enough the account was debited again on the 20th May 2020 ?? ..i called the cancellation help line and they told me that i already called in earlier on the same day to speak to another consultant and i confirmed its true as i was also looking for my invoice for proof..and the lady refused to assist me (unfortunately i forgot her name) ...now im stuck with the account i dont need and use and vodacom does not care ..they only attend to people who wants to take out new account or upgrades...who can help me take the legal route with these? Vodacom has the worst customer service in south Africa ...