CESC Demerger - Bonus Shares not credited

I have my demat account with zerodha.
I was holding 103 shares of CESC and sold them on 1st Nov 2018.
Everyone who had CESC shared at the end of 28 Oct 2018 was to get bonus shares of CESC ventures and Spencer Retail Ltd.

I am yet to get any bonus share? Whom should I contact? where should I raise a complain?

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