As I am getting married on (date) , please grant me leave for one week.

First cancel the order. They failed to do their duty and also their service in future will not be good.

Shares gives you power as one of the owners of the company.  You have right to vote company's decisions.  You are eligible to get Dividend - profit sharing of the company. But debentures are like bonds which can give you a fixed interest for a specific period. Hope you understand.