So, here's my tale of woe:
I used to own a Wii U. Bought it on launch day, had to sell it earlier this year due to money issues. I kinda knew I'd lose the few games I had on it, but I assumed that as long as I unlinked my NNID from the console, I could reuse it in the future - which is obviously what I want, as I use it on my 3DS.
Two weeks ago, I bought a Wii U as a replacement. Tried adding my NNID...no. Not letting me. And yes, I did definitely unlink it.
Phoned Nintendo UK support. Got essentially told to sod off by a very condescending rep. I then sent in an email basically stating I was unhappy with the service and that I wanted it rectified. Got a scripted response telling me I am sod out of luck and I should try going to whoever I sold it to in order to get the console back (seriously)
So I replied again, pissed off now, with a new email. This time, I linked to this Neogaf thread long with quotes proving a transfer can be done.
The next day I got a response stating my query would be passed onto head office. No offer of any timescales. Again, poor service. I work in customer service quality control for an extremely large online firm, and I know that Nintendo's support is absolutely below any standards I would encounter at work.
Over a week later, I got an email stating the transfer had been done. Yay. I've got all my 30p promotion games back too, as well as the Premium promotion points.
Regardless, Nintendo UK have without a doubt the worst customer service I have ever encountered in my entire life. Utterly, shockingly appalling.