  In this paper we consider generation of naturally small neutrino masses from
a dimension-7 operator. Such a term can arise in presence of a scalar
quadruplet and a pair of vector-like fermion triplets and enables one to obtain
small neutrino masses through TeV scale linear seesaw mechanism. We study the
phenomenology of the charged scalars of this model, in particular, the
multi-lepton signatures at the Large Hadron Collider. Of special importance are
the presence of the same-sign-tri-lepton signatures originating from the
triply-charged scalars. The Standard Model background for such processes is
small and hence this is considered as smoking gun signal of new physics. We
also looked for events with three, four, five and six-leptons which have
negligible contamination from the Standard Model. We further point out the
spectacular lepton flavour violating four-lepton signal which can be the
hallmark for these type of models. We also compute the added contributions in
the rate for the Standard Model Higgs decaying to two photons via the charged
scalars in this model.
