You have to ascertain the company’s revision policy. They are supposed to offer free revisions. This is because they produced the work and you paid for it. If you do not like it, as them to revise it to meet your expectations.
Dissertations need expert writing, and you will need thesis writing services. If they are up to that level, then you will have a better chance of finding a quality company. This will ease the pressure that comes with your dissertation especially to graduate students.
Remember that you have enlisted their services. In other words, they are working for you. Their work is an investment in which you have put money, and you deserve good returns. They should give you a free title page, formatting, outline, and bibliography.
Identify if you can access their customer service at any time of the day. This is crucial because you do not want to entrust something crucial to your education to someone without knowing what is going on with the assignment and the success at the same time.
Every person has a writing style that most professors are able to tell because they have marked your work for long. As such, the writer that you settle for must be able to match the essay with your writing style.