Hmm...gathering from the inference by Martha in a reply to you, I would guess that the refund was issued because the paper failed to produce a passing grade.
I've been doing business with Academic Paper Editors (PE) for a little over a year now and I have never had a major issue. Is it a perfect service? No! Have problems arisen? Yes!

For the most part, all the papers I have received from Academic Paper Editors have been anywhere between good to great. Some required editing to meet the demanding nature of a professor, and some have been of a quality far surpassing my expectations. Over the year I have learned a few tricks that can easily apply to any writing service.
(1) Place some lead time in your deadline. Don't require a due date that is actually the night before your paper is due. This will not provide sufficient time if there is a problem with the paper or if the paper is late. I typically require my ordered paper one week before the actual due date. This allows extra time if the delivery is late (mail servers do sometimes fail to deliver email in a timely manner), if there is a problem with my paper, or if I need to edit a paper in accordance with the original requirements or to make it match my writing style (good professors can tell the difference).
(2) Be extremely forthcoming in providing the writer ALL the requirements, notes, and supporting information you can. I have been known to inundate some of the writers with comments and material BEFORE the paper is written. This avoids misunderstandings and increases the chances that the paper will be delivered near perfect for your intended use. In the past, I have received a paper or two that did not meet my specifications; however thanks to the padded time I built into the project, PE has always rewritten the paper to meet those specifications without charge. These have been instances in which I had provided the requirement beforehand and it had gone either unnoticed or overlooked.
Having said that, there are a few things PE could do to make it a much better service. There is no quality control before the paper is delivered. You place your order, PE brokers the assignment to a writer, the writer sends the paper to you directly without review or checking by PE to make sure it meets specifications. A pet peeve is that whenever I order a paper in APA format, the margins are always wrong, which in effect "cheats" me out of a few pages (depending on the length of the paper). Apparently the only review occurs when you voice a concern after receipt. As far as I know, this is the only time PE and the writer sit down and match requirements with the paper.
One last point I would like to make. The paper stands on its own. You order the paper, receive the paper and read it before turning it in. It may very well be an excellent paper as far as you and the writer are concerned, BUT neither of you are assigning the grade. It all boils down to what the professor thinks of the paper, which is simply impossible to predict.
Case in point, I have been having an extremely rough time with one class and have had two writers from PE working on different segments. One track consistently received higher grades and praise than the other. Thinking that one writer may be connecting with the teacher a bit better than the other, I tried switching writers and tracks. The writer who received higher grades (track 1) actually received the same lower grade and same criticisms as the other writer (track 2) and vice versa. The moral is simply that sometimes, regardless of the quality of work that is submitted and who writes it, some teachers will never be satisfied or happy with it.