  We present Raman spectroscopy measurements of the van der Waals bonded
ferromagnet Fe$_{3-x}$GeTe$_2$, together with lattice dynamics. Four out of
eight Raman active modes are observed and assigned, in agreement with numerical
calculations. The energies and line-widths of the observed modes display an
unconventional temperature dependence at about 150 K and 220 K, followed by the
nonmonotonic evolution of the Raman continuum. Whereas the former can be
related to the magnetic phase transition, the origin of the latter anomaly
remains an open question.
