I took a Building insurance policy with MiWay, that I later cancelled after moving to a competitor

I took a Building insurance policy with MiWay, that I later cancelled after moving to a competitor. However, a week after canceling it, a debit order went off my account. Another week later, another debit order went off. They debited my account twice despite the policy having been cancelled already. I lost R260 in bank charges for bounced debit orders which shouldn't even have gone off in the first place. The reason they went off - "the junior consultant attending to your case did not update the system after cancelling your policy. I apologize for her error, but there's nothing else we can do about your bank charges." I'm so disgusted by such poor service!