I took my hard earned 150 IPO shares of ADBL to a broker for sale. I clearly mentioned the selling price of RS 520 in writing. The broker couldn't sell as the price never hiked that high.A few weeks later I got called and was told to my surprise that my 150 shares were sold at a rate I never talked about; mere Rs 471.I informed the broker about this possibly unintended mishap. They could not find my written selling order slip. The broker agreed to buy back the same number of shares for me. However, the broker has not called me till date. I feel cheated if not badly ignored. What should I do?