Blue Dart Express — package not delivered to the right person

My package was about to delivered by bluedart. I got the updates via sms that it has been delivered and when i checked the tracking status it was delivered to someone else. I need to know where my package is and why it is not deleivered to the right person. I want my package to be delivered again otherwise i will take the legal action on this. Please look into it at priority. I have already dropped an email twice to the customer service but did not receive any response.