On October I looked for a copywriter on freelancer. My need was 1 article of 2000 words and 10 articles of 500 words. Then I hired a guy. He has offered himself to write this 11 articles for 80$. Anyway as soon as I hired him he said that for my needs was much better to write 1 articles of 1000 words and 10 articles of 350 words. He said that people usually do not read large wall of text like the one I was needing. So I trusted him and I accepted 1 article of 1000 words and 10 of 350 words for 80$. He did a really good job and I was really satisfied. As soon as he finished his job I said I was going to offer him another project like this one (1 articles of 1000 words and 10 of 350 words) at the start of November. He said okay. So I prepared my 80$ and at the start of November I asked him to work again with me. But this time without previous warning he asked me 100$ for the project. No problem, I accepted. He did a really good job with the previous one. Again he did a really good job. So I asked him I was going to offer him two project like the previous at the start of December. He said okay. So I prepared my 200$ (100$ * 2 project) and at the start of December I asked him to work again with me. But this time without previous warning he asked me 280$ (140$ * 2 project) for finish the job. I said him that he was crazy. After few days I managed to offer him 240$ (120 $ * 2 project) and he accept. Anyway this time the first two articles he send me was a complete disaster. He missed few instruction on the first article and the second one seems to be written by google translate. So I let him notice all this problems and he started attacking me. He said that I do not respect his job, because previously I said he was crazy. He also said that articles he send to me was good quality and that I'm trying to humiliate him. He said that because of that he is lacking the motivation now to work with me and suggested me to quit the job. I don't know what to do. I really liked his previous job so I don't really want to get rid of him but the articles he is sending me now are completely trash. What would you do in this case?