Reserve Bank Of India [RBI] — Encashment of demonetised currency for NRI

Address:

Chennai, Tamil Nadu

I am T Swathi. I was married on Apr 2016 and left India to join my husband in CANADA on June 9th. In my marriage I recd. a lot of gifts from friends and relatives including in cash in the demonetised currencies. This money I had kept along with my belongings in my In-laws house before leaving to Canada under lock and key, which I had retained with me. I returned on 13th Jan 2017 for a short stay. Since I was not aware of the amount I had not declared the same on my arrival in India at the customs. The total amount of the demonetised currencies with me now is Rs.1000*41 and Rs.500*54 totalling to Rs.68000/-. I went to exchange the same at the RBI in Chennai with all the necessary documents, my Passport, Emigration and Immigration details, Bank statement, PAN card. I was refused exchange on the grounds that I had not declared it in customs. Since I was not aware of the currencies available with me I could not declare it at the customs. Please let me know how to exchange these notes. I am again leaving to CANADA on the 9th of March. I have three accounts.
Please let me know how to encash this amount. I have authorised my father for further actions in India.