Cost of improvement of unlisted shares

Dear Experts

I had purchased shares of an unlisted company before 2012 on different dates on which Rs. 8 was paid up. Rs. 2 was called by the company on 31.01.2015 and paid by me on the same date. These shares were subsequently sold by me on 10.02.2017. Whether benefit of indexation will be available on cost of improvement (as improvement was done within the period of 36 months before the sale of shares)?