I was given a set of access code for my Open Water online manual about 4 months back (and completed the course shortly after). However I tried to log in again few days ago and it says "You do not have any materials". When i tried to re-enter the code, it says "The entered code has already been redeemed or is expired". Any idea how can I retrieved my eBook? I've tried emailing PADI but no reply from them.