I Need a rewrite for My Original Ebook. Any recomendations?

This is getting so damn frustrating but I will not give up. I have learned some valuable lessons along the way. I have spent way too much time on this and it has me way behind schedule.

First I hired a writer here from WF, paid in advance and fed them all the links to retrieve info for the writing. The writer went 6 weeks longer than quoted and many excuses but finally finished it. The book came to me in plain text, no format, no index,no preface, no table of contents and no conclusion. The writing was OK at best but did not engage the reader.

So I hired another writer here on WF, paid upfront and told them that I wanted the book to be rewritten with some added passion. I get book back and it was in worse shape than the original I sent. Long story short I had to file with PP for a refund. The so called company (writer) made it such a fiasco with threats to me by way of PM that I almost threw the towel in but instead hung in there and PP refunded my money.

I am now 4 months in to this and need to get it finished. I am looking for a native English writer that is here in the US that can write this 50+ page, 14,000 + words, Ebook. I have all the basics there and there may not even be much research since I originally furnished it.

Because I have had these bad experiences with paying upfront, I need some one that is confident enough in their writing abilities to get paid in progression payments or at the least 50% down and balance when completed to my satisfaction.

Please do not respond if your writers are not US based and English is not the native tongue.

Sorry about the rant!