WORST CANCELLATION EXPERIENCE EVER!!!

I cancelled my contract with Vodacom in June 2023 as my contract was done, to my surprise I was billed for July 2023 and I have tried a couple of times to get assistance with no luck. It seems that the agent who assisted me the first time did not even put the cancellation through in June and i had to find this out when i called in 2 days (23 July 2023) prior to their debit date in July 2023, the second gentleman that assisted me told me that he logged in a request for a refund, guess what i am still waiting for my refund as this was 3 weeks ago. My question is... SHOULD I SUFFER FOR SOMEONE'S NEGLIGENCE? Your service is beyond horrible as I am still struggling to get hold of the cancellation/billing department as my simcard is now prepaid. I want my full month refund for July 2023 as i have finished my contract and have paid what is due to you. NEVER AGAIN WILL I TAKE A CONTRACT WITH YOU!!!!!!!!