Stryker Manager interview questions

This was the most grueling interview process I've ever experienced, especially for a mediocre role within the organization. I first interviewed mid-July with the recruiter and quickly after that the hiring manager. Before getting moved to the next step I had to complete a 2-hour interview with Gallup and answer over 150 questions. That apparently was enough to move me to the director for the next step. Once I finished those 4 interviews it was weeks before I got any next steps. Finally, I heard that I had made the cut and was moving to another step. I was informed I had 4 (!!) more interviews to complete, one of which included the manager and director I had already met, plus an additional 3 new people. For this interview I had to prepare a 20-minute presentation for them. Following this interview, each "new" executive I met wanted a 30-minute individual interview. I took a WHOLE DAY off of work to complete this nonsense, not to mention the time it took to prepare the presentation, and the 4 additional interviews I had completed prior to this. I was told following interviews 5-8 that I would hear within a week. It's now been nearly 3 weeks since the final interviews and I have yet to be contacted by the recruiter or hiring manager despite phone calls and e-mails requesting ANY follow up. After all that work, to be ghosted, is entirely unprofessional for a company that boasts about how great their culture is. I'm debating sending them an invoice for the 8 (!!) interviews I completed and my time to prepare the presentation they requested.