Sure, the lawsuit is about Zenefits lying about the situation after ADP cut them off. That is important because the Zenefit/ADP hybrid customers want to know who is at fault and Zenefits is implying that ADP terminated some kind of "partnership", which is both false and casts ADP in a bad light. That, in turn, could cost them money and customers. and these factors together are pretty much the base criteria for slander.
http://blogs.wsj.com/digits/2015/06/10/adp-sues-zenefits-for...