  We consider the collider phenomenology of a simple extension of the Standard
Model (SM), which consists of an EW isospin $3/2$ scalar, $\Delta$ and a pair
of EW isospin $1$ vector like fermions, $\Sigma$ and $\bar{\Sigma}$,
responsible for generating tiny neutrino mass via the effective dimension seven
operator. This scalar quadruplet with hypercharge Y = 3 has a plethora of
implications at the collider experiments. Its signatures at TeV scale colliders
are expected to be seen, if the quadruplet masses are not too far above the
electroweak symmetry breaking scale. In this article, we study the
phenomenology of multi-charged quadruplet scalars. In particular, we study the
multi-lepton signatures at the Large Hadron Collider (LHC) experiment, arising
from the production and decays of triply and doubly charged scalars. We studied
Drell-Yan (DY) pair production as well as pair production of the charged
scalars via photon-photon fusion. For doubly and triply charged scalars, photon
fusion contributes significantly for large scalar masses. We also studied LHC
constraints on the masses of doubly charged scalars in this model. We derive a
lower mass limit of 725 GeV on doubly charged quadruplet scalar.
