I should never trust my clients

I felt unlucky on this week. I suspected I had been deceived. I got a design job on Saturday. Because my client said that it was so urgent. He wanted to confirmed design before Monday (what do you mean? Maybe "He wanted a finished design before Monday"? or "He would confirm the design before Monday"?). But he need had to pay (or "He would pay) the deposit on Monday. So that I did it first. He promised he will would pay money me on Monday. So I trusted him. He had confirmed the design, but he was not didn't (did not) pay money to me!!!!

I'm not a native-speaker, but I hope this will help you a little =)