A man was sick by cancer since last two years. We paid him the salary last whole year, but now our HR said that stop his salary and issued him a warning notice as last warning notice and ask him to show the documents. we send him the letter through courier but due to wrong address the letter was returned. We send him enquiry notice on same address thats also return then we send the same letter on his new address. That is also returned due to the same reason we put his cell number on his address envelope. After that our HR decided to ex parte enquiry against him. Is it legal and can we decide ex parte enquiry after the second day of enquiry. and how? please help me in this matter immediately.