My sister died in February due to maltreatment and...

My sister died in February due to maltreatment and medical negligence of Aga Khan Hospital. I asked for the case to be reviewed and demanded the director's email address. I got a reassuring email that my case was under investigation but still was not given the director's email. It has been 2 months but I still have not recieved any outcome of the case review and the staff have not been replying to my emails demanding this outcome.