Merck Director interview questions

Interview consisted of an HR phone screen followed by 1:1 with hiring manager. Then invited for a full day of individual and panel interviews as well as a 1 hr seminar with Q&A. References were requested and contacted and then I was ghosted and inquiries to both the hiring manager and HR rep went unanswered. Quite unprofessional given the length of engagement and commitment to the process on my part.