Good day to you! I am a specialist English communications teacher, and I can help you with every level of your business communications needs.
It is my preference to work 1-to-1 with people. Only when I help a particular writer or speaker can I help him or her break through the problem. But I can work with people in email assignments, if Skype or other online technologies are not available for you.
I would ask each person to do a piece of writing, a business profile or report, for instance, and then I would comment on their writing so that they understand the good things and the bad things they did. For $50 USD, I would do this for 10 people.
I would not, however, accept this project as proposed. I will gladly work with you to create one learning experience for free, and then re-define the project as you need it.
Based on the way that Freelancer pays the person doing the project, you should be very careful of anyone who would accept this contract as written; they will lose the money, it's true, but then, also, you will not have your project finished. Also be careful of the English certifications, as a person can take these tests as many times as they are willing to pay for.
I am happy to discuss the project with you, as you have time. I will be available to chat in Freelancer as much as possible.
Best of luck to you and to your employees, no matter what you decide.