When To Receive HPCL Technical Officer Trainee Interview Call Letter ?

Hi, Please tell me when will I receive the Call letter of HPCL officer trainee Interview ? They have provided the link for downloading the HPCL Interview details but that link is not working.

Please guide me or suggest me how to get details about HPCL Interview.

Link of HPCL : http://www.hindustanpetroleum.com/En/UI/CareersCurrentOpportunities.aspx