want my salary

I worked in Mega infomatix software solutions , Lucknow from feb 2018 to oct 2018 as a web developer.
I resigned on 5 oct 2018 and recieved my reliveing letter and expeirence letter but i didnt get my salary of septempber month and security money(monthly deduction).Its being 6 months now. please suggest me what am i do now.

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