"Putin Is A Huge Dick: A History of ... you know what, I'll just take the F."
While the average American student might be horrified at those kinds of mistakes, a great deal of the clients don't mind. Because they, too, are foreign students, struggling with English and cultural context themselves. They don't see anything wrong with the product they get ... well, not until the grades come back. See, students may go with our site because it promises them an A, but when it comes back with a C, or an F, or a "what's the deal with you and Ukraine?" - we just point to the Terms and Conditions, which make no promises about grades at all.
I also did a stint as a call-center agent. Directly answering for the mistakes was a lot less pleasant than trying to catch them: Clients would call, angry about their grades, and demand to speak to a "manager." As a native English-speaker, I took on this entirely fictitious role. I must've been good at it: We've had customers who failed their papers, but gave us a second, and even third chance anyway.
Worst-case scenario, they vow to never do business with us again. So they'll go find another site - which, as noted before, will probably be us as well. No matter which number they call, it all gets directed to the same call centers in Rivne, or Lviv. When they do call, the number they dialed initially flashes on our screens, so we know to pretend like we're Supreme Essay this time, and are leagues above those other suckers.