It seems you have already done your part to make them aware of the problem. If they, for some reason do not comply, there is very little left beside calling the cops, which will eventually make them more pissed off. In a country where people have guns, the wise thing to do is to move out. If things do not change after you talking to the owner, there is nothing you can do with lowlife scums. Risk your life staying there facing all the troubles, or spit on the deposit and move on.
Trust me, just they are immigrant of Cuban origin does not mean they should be better understanding. Good and Bad people are everywhere, even in Nepal, Phd or not.