Thank you for your reply to my question.
You are right about the fact that I had to talk to an attorney or have a well written contract in the first place. But to be honest at that time It was just 1 year that I came to US and had no idea and never thought I'd be screwed by these people like this.
So at this point, I do have emails and texts with them arguing about the payment for the logo as well as discussing share of ownership that they promised me in the first day (verbally) because of my contributions to the company.
Bottom line, is there anything that I can legally do with not much cost to at least stop them from using my artwork !!!? even Small claims court you think I may win?
Also, what if I, as the original designer of the logo, sell it to another entertainment company working in the same area? how would that work?
Thank you very much

Also, One more question is, As you mentioned after three months period if I fail to register the Logo I'll not be able to pursue Damages, since it is almost a Year passed that they started using the logo, do you still recommend me to register the logo and pay the related fees ? does it do any good for me at this point?

The problem you have is economic----you want to pursue these claims "with not much cost..." But it costs money to pursue copyright and contract claims in a situation like this---lawyers do not work for free. And before anyone could advise you on the next steps to take, the first issue is whether it makes economic sense to pursue this. After all, there are lots of creative people who can prepare logos and artwork for little or no cost.

Note also that you cannot get a small claims court to "stop them"----small claims courts deal with damages issues only in cases where only a small amount of money is in dispute. Copyright cases cannot be adjudicated in small claims court, and this does not sound like a small claims court matter.