I haven't heard great reviews about most of the DMCA services that currently exist. CMP is a no-go. Many of them will promise that they can get things down for you that you won't be able to on your own. In reality, they are just taking your money and trying their luck the same as you would be if you did it yourself. Many of them have turned out to be really sketchy and scammy. They don't have any extra power to get non-complying sites to take things down. I imagine the value in most of those services lies in the "We seek out your stolen content for you!" part of what many of them offer. I would try on your own before you start paying anyone else to.
HOWEVER, if you are certain that you want someone else to try to do it for you, I would go with
AMS if their service is still available, because I know for a fact that they are trustworthy.
@JoleneBrody has worked closely with them for years so I would view them as legit, perhaps she will be able to chime in with info on their offerings.
Unfortunately, many of these sites are hosted internationally in locations where complying with a DMCA request is not of much concern. But I wish you luck in doing some damage control!