18 months of Debit Orders still not cancelled.

I've had numerous engagements with ABSA over the past 18 months. I've sent cancellation letters, proof documents, the works. I continue to have debit orders taken off my account after cancelling my Life insurance policies 3 times. The issue is not being resolved. Ironically, I like iDirect. ABSA Life though, don't ever use them. The are unable to cancel a policy, and do not admit any error on their part. Despite communications requesting confirmation of cancellation, to which I got no response. The debit orders continue to go off.