Where to complain about a name not delivered by NJ?

[centreurope]

Hello
I paid on the 18/11 a domain which has not been delivered yet
As usual, the support has answered with a few copy&paste messages, but does nothing.
I'm facing a very upset client.
Like everybody in this industry, I know that Networksolutions/Snapnames/Namejet is the worst company ever, but is there a way to complain somewhere?