Should I continue pursuing this opportunity with Manpower?

A verified recruiter from Manpower reached out to me via phone regarding a position I had applied for that had reopened. They mentioned they would get back to me in about three weeks, just before the holidays—no problem.

Three weeks later, I received a call, but unfortunately, I was at work and couldn’t answer. I called back within 10 minutes, but a different recruiter took my call. They assured me that my original recruiter would reach out in 20-30 minutes—again, no problem.

A week went by without any communication, so I followed up and was told that my recruiter would call back that same day, as things were busy. After four more days with no news, I called again, and the representative was unsure why I hadn’t heard from anyone. They escalated my case to a supervisor and promised a call back within an hour.

Now, it’s been two weeks since that last interaction with no response. I’ve tried returning calls multiple times, left voicemails, but haven’t heard back. Am I possibly blacklisted for this opportunity? Should I keep trying to reach out?