I'm not too familiar with Fiverr, but as with any site where people offer services, just read the reviews and ratings that vendor has received, and you should easily be able to tell if they're a reliable source or not.
That being said, while they may be able to deliver you 200 likes, why would you want to spend money on fake likes? It does nothing to help the growth of your channel, and will just cast a shadow over your content. Not to mention that it'll look incredibly suspicious to potential viewers. More importantly, while these vendors don't run the risk of getting into any trouble, your channel does if YouTube detects some irregular activity like this. Don't go down that path.