Long story made short, Amazon may confiscate royalties from infringing copies of your book and pay them to you, but you’ll need to follow their procedures to the letter:
You must fill out Amazon’s online copyright infringement complaint form, or send a written claim to Amazon’s legal department.You must file a separate complaint for each Amazon territory (Amazon.com, Amazon.ca, Amazon.co.uk, Amazon.in, etc.)You must explicitly request reassignment of the infringing copy’s royalties. Amazon rarely volunteers this information, so it pays to be aware of your rights.
MUST READ: Piracy, Plagiarism, and Impersonation - Part 3 of 3 | Alliance of Independent Authors: Self-Publishing Advice Center