Here’s one of the tests. Notice vacation is explicitly called out.
> Are there written contracts or employee type benefits (i.e. pension plan, insurance, vacation). Will the relationship continue and is the work performed a key aspect of the business?
Your employer is clearly treating you like an employee while paying you like a contractor. This kind of thing is common. But the more US jobs get outsourced like this, the more likely it is that people will notice and demand enforcement actions.