India Post — complain about poor service of india post

Ed[protected]in item has been sent from new delhi on 27th of november via speed post. While asking the in-charged person she said it will maximum take 3 days to reach the mentioned address. But now it's been a week that the item has not been delivered to guwahati address. If i would have known that it will take so many days i would have not sent it via speed post only. Please see to this problem and deliver my item as soon as possible.