Terrible customer service

I had a combined account with Vodacom for 3 cellphone numbers. The contract of the lapsed in May 2021 and subsequent to this I have cancelled the contract both on email and telephonically with reference number ***. To my surprise. End July 2021they deducted R639 which I have reversed from my back and only paid for the current that ends in November 2021. I am not sure whether the people at Vodacom hires competent to execute their jobs . I’d like this matter resolved asap.