How do you report copyright book download illegally?

My ebook that is in e-format ( pdf, azw, epub) for sale online through different websites.
Is it illegal to get my book from other torrent websites which offers free or subscription download option.

Now I am very curious.
Who stole my ebook and put it website for illegally download?
You can buy Aegean Recipes Vegetarian Dishes Cookbook ebook from my website as pdf file
You can buy at as azw file format.
You can buy at iBookstore as epub file format.
You can buy at Google Books as pdf file format.

So since only my site and Google Books are offering pdf version of the ebook, I am wondering how secure downloading process is.
I checked my website, which there was no suspicious download at all.
I looked at my log files, nothing there also.

I just have a hard time to believe if anybody bought my book, and turned around put it torrent site for free download. It just does not make sense!
a) It is only $4.00
b) At Google Books you can even buy $3.06! ( there is discount there )

So who would bother to download a book which is not expensive at all, and put on a torrent site?….

These websites have direct link to torrent website page:……

it is illegal to download copyright books

My first reaction was contacting them. I submit complaint to them via contact form and with my email, no respond from them.
It is interesting to see they use Google account as support email:

Then I searched about website.
I searched their IP addrress and who is info; as you may guess it is hidden.
IP Address: (ARIN & RIPE IP search)
Record Type: Domain Name

They use PUBLICDOMAINREGISTRY.COM to cover their tracks.
Then I also filed a complaint to PUBLICDOMAINREGISTRY.COM website to report them this website is a torrent site and offering illegal downloads.
Nothing happened as result.

Then I decided search who index these pages. Nothing in Bing, but Google search engine has these links publicly.
I wanted to send these informations to them and ask them remove these contents from their search engines.
Apparently they have a policy for that.
You can submit your copyright issue here:

Digital Millennium Copyright Act – Web Search
It is our policy to respond to notices of alleged infringement that comply with the Digital Millennium Copyright Act (the text of which can be found at the U.S. Copyright Office Web Site, and other applicable intellectual property laws. Our response may include removing or disabling access to material claimed to be the subject of infringing activity and/or terminating subscribers. If we remove or disable access in response to such a notice, we may notify the owner or administrator of the affected site or content so that he or she can make a counter notification. It is also our policy to document all notices of alleged infringement on which we act, including by sending a copy of the notice to one or more third parties or making it available to the public.”

Removing Content From Google

I have read articles on Google Help page here:
Removing Content From Google. This tool will guide you through the process of reporting content that you believe warrants removal from Google’s services based on applicable laws.

Unfortunately Google might remove these pegs from index search but the illegal website provider does not seem like cares!
Even though bottom of the page it is written “The purchase of a membership is not a license to download copyrighted material. Please do your part and respect copyrights.”

Do you think they care?

In US they have laws like this:
“Is it legal to download works from peer-to-peer networks and if not, what is the penalty for doing so?
Uploading or downloading works protected by copyright without the authority of the copyright owner is an infringement of the copyright owner’s exclusive rights of reproduction and/or distribution. Anyone found to have infringed a copyrighted work may be liable for statutory damages up to $30,000 for each work infringed and, if willful infringement is proven by the copyright owner, that amount may be increased up to $150,000 for each work infringed. “
Read more here:
The question is how do you enforce them?
1. Contacting them by email ( no respond )
2. Contacting them by mail ( no address )
3. Contacting them by domain provider ( it is hidden )
It seems like torrent sites gets free ride online by selling other people’s work.
Is there any better way to stop this?