Debit order deducted on closed account

Vodacom has incorrectly deducted a debit order off my account!! I cancelled my fiber contract with Vodacom 4 years ago, with no activity on my account since then (because it's cancelled) and on the 1st of April 2022 they deducted the debit order out of the blue! I even had to struggle to get Vodacom fiber to cancel and end my contact upon expiry, having to follow up with them the whole time and now they can't even get their affairs in order and charge me for a closed account that has been closed for 4 years. This is absolutely ridiculous. Customer care says the account hasn't been cancelled - can you believe after all this time they didn't close the account and just decided on the 1st of April 2022 to start it again. Honestly WORST service. Even when I had Vodacom Fiber the service was horrible, contacting them is tedious and horrible and you have to follow up with them the whole time or things won't get done. They can't perform their procedures without you following up Please don't make the mistake of chosing their horrible service