Amazon Recuriter not replying

I received a Linkedin DM from Amazon Recruiter on April 10th, she asked me to apply to a job role. I did, got an OA, cleared it.

Then got a phone call asking for my availability, I gave it for the last week of April and nothing moved forward. Then suddenly they sent me a mail on 14th May that my interview would be 4 rounds on 19th May, but I asked for rescheduling as I was busy that day with my current organization and this was not the original dates I asked them.

Later I get a call next day for scheduling interview, I asked them they can do it whole next week and the week after, nothing got scheduled and no one is replying back.

Any solution? Should I consider it as a dead end?