Should I continue pursuing this opportunity with Manpower?

I was contacted by a verified recruiter from Manpower regarding a position I applied for that has reopened. They mentioned they would follow up in about three weeks, coinciding with the holiday season, which I understood.

Three weeks later, I received their call but unfortunately missed it because I was at my current job and couldn’t step away. I returned the call within ten minutes, but a different recruiter answered. They assured me that my original recruiter would call back within 20-30 minutes, so I felt hopeful.

However, a week went by without any follow-up. I called again for an update and was told that my recruiter would reach out by the end of the day, as things were busy. After another four days without communication, I made yet another call and was informed that they didn’t know why I hadn’t been contacted. They promised to escalate the issue to their supervisor and said I should expect a call back within an hour.

Now, it’s been about two weeks since that conversation, and I still haven’t heard anything. I’ve made several attempts to return calls, but no one answers, and any voicemails I’ve left have gone unreturned. Am I potentially blacklisted from this opportunity? Should I keep trying to reach out?