The situation now is that you are lucky if you get paid the correct amount or even at all.
OE should not be called Optimum English, but Obscenely Evil since they care nothing about English education anymore, they only care about money now and if you work for them they will try hard to screw you out of money or maybe worse, they might try to destroy your life. Don't sign a contract with them, they have no respect for contracts and there is nothing you can do about it.