decay of a metastable WIMP to a super-weakly interacting dark matter sector. We consider the presence of discrete flavour symmetries at a scale between electroweak and Planck scale to dictate the patterns of neutrino mixing, neutrino mass as well as DM dynamics while the Planck scale suppressed terms break these global discrete symmetries affecting the neutrino as well as DM sector. Presence of an intermediate scale makes the Planck scale suppressed terms relevant in the discussion which otherwise would have been of marginal importance through the usual Weinberg operator $(L L H H)/M_{\rm Pl}$ that remains several order of magnitudes below typical neutrino mass scale, in the absence of any intermediate scale between electroweak scale and $M_{\rm Pl}$. We show that the scenario can have interesting predictions in both neutrino and DM sectors. In the DM sector, we also discuss the corresponding phenomenology in the presence of a spontaneously broken gauged sector which forbids several Planck suppressed terms present in the scenario where DM sector is charged only under some discrete global symmetries.

This paper is organised as follows. In section \[sec:model\] we discuss our flavour symmetric model and possible Planck suppressed operators. In section \[sec2\] we discuss neutrino mass 