|With a new item under warranty the vendor is liable/obliged to resolve the problem - not the customer.|
Depending in where your based/living of course does depend on what your "rights" are in this respect.
I would take it back and ask seller to resolve the problem; and if they won 't - or can't - ask for your money back.
Behind the scenes as it were you might contact D-link support and refer the problem to them - as they may know there is bug/problem with the that model and aren't being "too open" about?
This incidentally is from the UK D-link support section:
Makes interesting reading re' warranty etc.?
And this - from the UK support section - is their UK contact address etc. Presumably there will be similar for wherever/whichever site you need to use (if not in the UK). Although I suspect if you contact even the UK site and explain the situation they may (hopefully) pass on your message etc to wherever/whichever D-link area you're in - if not actually resolve the problem for you?