Do you know Steven Allison? I think I was scammed

I recently contacted Steven Allison, 'The Freelancer', so he was supposed to help me edit one article and write another. At the beginning the communication was good. The delivery deadline of the articles was on April 27, 2017. However, since then, I have been sending him emails and I have not received any answer.

Unfortunately, I ordered other articles and I have paid him using paypal. The deadline of those articles oscillates between the end of May and June. But I think I will not receive anything.

I would like to know if you have had the same experience with Steven.

I can give you more information about him in the following messages.

Yes, the first deadline was April 27 and the writer hasn't responded (I ordered 2 articles). And now I'm worried about other articles which I had paid before the deadline of the first 2 articles. And what also worries me is that he does not respond to any of my messages.