  Manipulation of magnetic ground states by effective control of competing
magnetic interactions has led to the finding of many exotic magnetic states. In
this direction, the tetragonal Heusler compounds consisting of multiple
magnetic sublattices and crystal symmetry favoring chiral Dzyaloshinskii-Moriya
interaction (DMI) provide an ideal base to realize non-trivial magnetic
structures. Here, we present the observation of a large robust topological Hall
effect (THE) in the multi-sublattice Mn$_{2-x}$PtIn Heusler magnets. The
topological Hall resistivity, which originates from the non-vanishing real
space Berry curvature in the presence of non-zero scalar spin chirality,
systematically decreases with decreasing the magnitude of the canting angle of
the magnetic moments at different sublattices. With help of first principle
calculations, magnetic and neutron diffraction measurements, we establish that
the presence of a tunable non-coplanar magnetic structure arising from the
competing Heisenberg exchanges and chiral DMI from the D$_{2d}$ symmetry
structure is responsible for the observed THE. The robustness of the THE with
respect to the degree of non-collinearity adds up a new degree of freedom for
designing THE based spintronic devices.
