Debit unblocked after a year of stoppage as the debtor had system issues

Stopped a debicheck a year ago with Capitec.The debit order went off yesterday for 3k after a year of stopping it and wasn't the amount.Meaning also I had to pay twice to get this stopped and now had to contact the people who debited my account for my money.Capitec is saying I gave them the details.Which yes I did they are failing to understand this was stopped a year ago and paid for and the people deducting had a issue on there system that was there excuse.so I want to know how a debit got through capitec security after it has been stopped.I am tired of all this security flaws with Capitec.