Chances are you might have some difficulties with Cash Transfer Center. What state are you in? Most all online internet lendors charge the same...$25-$30 for every $100 borrowed. Remember that each payday they are going to attempt to make two withdrawals, and will charge $30 for each instance that come back NSF. They won't bargain.
And yes, they do love their wage assignments they threaten you with. However, wage assignments are totally voluntary, and are also suppose to be signed in person. You can simply write CTC a letter stating that you are revoking the wage assignment, and send it certified. Along with the wage assignment you can request them not to contact your place of employment.
What state are you in by the way?
Regards
Mike