Stock option with job offering

I was offered a job with incentive stock options to purchase x number of shares of the company's common stock at y price per share, vesting z shares upon start of employment. However, I had left the company
after several months before I received any official certificate/document of such a stock option. Do I have the right to ask for the x shares of the stock? Do I have right to exerise the option at stated exercise y price? Thanks.
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