Don't bother all they do is stuff you can do for yourself, like call up the credit card compnay and ask for a lower rate then pay the bill for you and you pay them, plus a service fee. If your credit is still in good standing you can call the credit card company and ask for a lower interest rate. If they won't give you one then tell them you are going to change companies and move your money to someone else's bank. Also if you are getting 0% introductory card offers transfer you balance to one of these for the promotional period so that you are only paying principle instead of interest.
The usual obvious stuff helps as well, don't use the credit card so that what ever you pay makes it go down, over pay each month so that it goes down faster. Make lunch instead of going out and buying it every day and put that money aside to pay down the card.