Why did you accept work for such a low price anyway.  Is this not your business?  You accepted work under those terms and conditions and then you complain-once you allow someone to make a fool of you - there is no stopping them in doing anything else.  That is what you did when you accepted those terms.  Say no - I promise you there are greener pastures - just take the time to find them.  If you didn't say no to drugs, you would be a drug addict?  Are you one?  If you didn't say no to peer pressure, you would probably be a delinquent?  Are you one?  If you are able to say no to other things that cause you nothing but harm, why can't you say no to things like this.  Every aspect of your life and your dealings should be dealt with good judgment and good sense.  You need to ask yourself why would you waste your time engaging in business activities that could only put your business under in a matter of time - all the energy and frustrations would be better utilized seeking companies with integrity and willing to pay the value of your worth.  Obviously, this client only values their time, efforts and profitability and not yours - is that what you want?