D.D.
Keep your $800 and do it yourself! They cannot "fix" your credit. YOU owe the money and you MUST pay it back. Take that $800 and pay off some the outstanding bills. Dave Ramsey has some wonderful advice and you can get it several ways: FREE Podcasts of his show on iTunes, Money Matters book by Dave Ramsey, Dave Ramsey's daily talk show on Talk Financial Peace University.
You can do this!