May be wrong but eujet has been operating for at least two years now.
with regard to pay etc, what does your contract say? This is effectivly legally binding and both parties signed it. If they are not paying on time or the correct ammount dont work till its paid. On the other hand they could be short of money and its time to bail out. They will chase for a bond (if your fltdeck) but if they can pay late so can you!