Failure to follow instructions

On the 13/10/2015 I emailed Discovery Life credit control to advise that I started a new job & will be able to settle all outstanding premiums on the 08/11 when my first salary. I received feedback from them but much to my disappointment I received sms notification yesterday that 2 debits were collected unsuccessfully from my bank account putting my account even further into arrears! What is the purpose of communicating with them if they are unable to follow instructions? I also attempted to change my bank account details with them but was told that they need proof of bank details. Now I just started working & work during lunch & on weekends which I explained, they advised I can ammend the banking information on their website but I have been unsuccessful in my attempts. So where to now because they are destroying my credit scoring with my bank. I need this rectified asap! I do not want my policy cancelled due to non payment when I informed them of my circumstances.