If you don’t pursue you won’t get any response or result.
You may pursue further after consulting elders of your family, competent and experienced well wishers, seasoned employee’s/trade union leaders, seasoned ‘ Authorized Representatives’, a very able senior LOCAL counsel of unshakable repute and integrity specializing in Labor/service matters and well versed with latest citations, LOCAL applicable rules/laws/ … and having successful track record…. and worth his/her salt…..with whom you may share inputs /show the documents/evidence for a considered opinion..
At each location three are some counsels that specialize in such matters and they are well known.
Check for such counsels at LOCAL Labor Court/CGIT, O/o Controlling Authority of Gratuity ( ALC/ALCC/DLC…), School-Educational tribunal,CAT, civil courts, HC, SC……