Creditors Financial Group, LLC it's not my credit report as bad debt, but i have record they check my report few months ago Aurora, Colorado

A "write off" is just an accounting term that is required when a company considers a debt no longer collectible.  It basically removes it off of their books, but it does not remove your obligation, it just moves it to another company(collection agencies).  When a company says "at credit grantor's request" it means that they closed it..again if you were delinquent this is not a good thing.

Now, the letter you got on 12-28 was probably a dunning letter to notify you of the debt, and to give you a chance to dispute it.  If you do not dispute it they will put it on your credit report, generally this is 30 days after the first notice.

Now, a debt can only be on your credit report for 7 years from the date of the last activity(usually the charge-off), this turns out to be about 7.5 years from when you first went delinquent.  So this means that the debt is from about July 2008, which means that it is still most likely a legally collectible debt.  That is the debt is still in the Statute of Limitations. 

30% is actually not as good as they may get, if you want to settle the debt(and you agree that it is valid).  You may want to send them a counter-offer.  You can try something like 25%, but since they still have the legal route hanging over you that is very unlikely, you are probably looking at closer to 50%.  Now, in your letter DO NOT sign it and only send it by Certified Mail.  Also, require that they only accept a Money Order(US Postal ones work great).  This is because you do not want to give them any access to your bank accounts.  Only when you get a letter from with arrangements you agree with is when you should send the money.

If you send this counter offer in it will probably happen after the 30 days, so it may end up on your credit report.  So you should also add that they need to delete their collection account once paid.

One final thing.  If you settle for less than the debt you will owe taxes on the amount settled.   This is still less than the amount you settled for, but if you forget to report this on your taxes the IRS will eventually catch up with you.

This is just general information, you should also search for things such as the Fair Debt Collection Practices Act(FDCPA) and Fair Credit Reporting Act(FCRA) to understand the regulations reguarding debt collection and credit reporting.  You can also find several templates on how to write various letters to collection agencies.