It is either they will check the mistake made and correct them if it was proven that there really was a mistake, or they will inform you that they will need additional evidence to support your claim. Thus, if you really want to make better your credit, you would want to start by making your credit report as accurate as it should be.
As another big step in repairing your credit, whether you are doing it on your own or with the help of a debt counselor, is the process of establishing a budget plan to limit your finances. This will help you prevent incurring obligations which you will not be able to handle anymore. This help you keep you from doing the same mistakes that you have made before. So here, you will see that you really do not need the help of credit counselors, because you can tell yourself what to do and not to do when it comes to spending your credit.
Yes, credit repairing is a serious matter and it will require a great amount of effort and time from you. But as you go on with the credit repair, you will realize that it really has positive effects that would be favorable for you.
Would it not be nice to know that you have made it through your credit problems on your own effort? You achieved it on your own. Perhaps, the hardships of the process of credit repair will teach you not to mess up with your credit again.