Discovery Health bad services

I have changed my banking details for mydebit order and gave Discovery a months notice but on 3rd August they still try to submit my monthly premiem on my previous bank. I have phoned the call centre to discuss this matter but they put me thourgh from 1department to another and finaly put me on hold and ended the call. It seems no one knows how to solved this issue. In the mean time i have to pay penalties due to no funds available on my previous Bank. This also means that, if a emergency should happend, i am not coverd due to Discovery's mistake. Lets see what happens!!!!!!!!