Contract Dispute

I had two contract numbers with Cell C due for upgrades in January 2020 which i arranged with the branch for one upgrade to be done and the other number cancelled however center could not assist me and referred me back to branch for the cancellation. Upon checking with the branch , i was advised that i can cancel via the phone, when i called back i was told the department is closed due to lock-down and Cell C apologized for the miscommunication given by the 1st agent. In May i was told that my cancellation was successful and should be effective end of June but surprisingly its now September and i am still getting billed for both contracts. I am truly not happy with this service , i cannot pay for a number that i am no longer using.