2-4 dislikes is many? The video might have been shared somewhere, or whatever reason there might have been a small boost to the viewership and perhaps 2-4 people honestly did not like the videos, everybody has their opition ofc. I honestly don't believe this is botting. Who would program a bot to give just a few dislikes?
But it's true, we cannot ignore the possibility of someone or some group of people speficically going and disliking your videos but there is nothing we can really do about it. Contacting Google is kind of silly in my opinion, how would they know if the dislikes aren't actually legit?!