From my experience it depends who's answering. If you lucky enough there will be someone who's really keen to look at the case, or someone who doesn't bother at all and just make up things.
How can my case van be with decision maker one day, and another back to case manager. When I look back on my calls I have a strong feeling my boys claim was all those months pushed behind and left like an unusual claim and let's look at it later. Then when I had a call from them almost two months ago to get some information about survivor's pension I was told will come back to me shortly with decision. Month passed and I finally started to call them for an update and by how that call was handled I could feel it was simply left there with no checking or nothing.