I'm an excellent writer and rewriter. See my portfolio for an example of a rewritten sales letter. My English is exceptional, as shown by my exam scores: 100% at levels 1 and 2, 95% at level 3.
Next time, though, make your project hourly, rather than flat fee, to get lower bids. Freelancer takes a 10% commission from the former, but a whopping $5 minimum from the latter. (I'd have bid $15 for one hour of work.)