I started a thread a while ago about the reverse. KL elite plus, not getting anywhere with Delta. ended up with the worst seats in TATL Y (middle seat in the back).

seems there are some issues with the systems from AFKL and Delta, or at least recognizing each others top level FF.

I have shifted all my travel to BA, and haven't looked back since. granted, this was not the incident that made me do so, but it sure was the final straw.