Yes Totentanz miniatures is (or was) a miniature brand from Basque Country. They got renowned a few years ago with the promising ranges you can see in their webpages.
However, as for the little I know about, the owner got a fatal illness a couple of years ago, then falling into a severe depression and... how would I say? ...unwillingness.
I have heard no news from this brand for a long since, so I'm afraid it's no longer working; most likely, there would be nobody to assist you, answer your questions or take your order.
A second fact I know is that Xan miniatures owner, who was commissioned to sculpt Totentanz' 15mm ACW range, has rescued that particular range under his own brand (coincidentelly, Xan is also the author behind my own 20mm SCW range).
There are some threads at this regard on TMP.
Sad to bring such news (and to explain them in a so rough way, due to my poor english knowledge).
Lluís