GLG Data Visualization Manager interview questions

The interviewing processes started off fast as they were interested in fast tracking me to the next round. I was then interviewed by the manager and asked to complete two different assignments that took me at least 3+ hours to complete. I never heard back from the manager after they said they would give me feedback on it. The recruiter kept saying I was still in the running all while waiting weeks between each reply. Last minute, they switched the position I originally applied for, but I went forward as I thought it was still a good opportunity. After all of this I was sent an automated email that I didn’t get the job after repeatedly being updated that they just needed final confirmation. Probably the worst interview process I’ve ever experienced thus far.