Overpayments. To receive important letters about overpayment recovery waivers, please ensure your mailing address is updated in your IDES account. The Department will attempt to recover overpayments from providers, or parents and other relatives, as appropriate, through demand letters, referrals.And when I appeal for a waiver, is there a form I fill out or just send my own letter to them or what? This Easy Form helps you make a letter to tell a collection agency that a debt is exempt from collection under federal and Illinois law. The letter must be in its original form, signed and dated within 45 days prior to being mailed to the Illinois Secretary of State's office. If you got a letter in the mail that says you got more money than you should have, please pay us back within 30 days. You will need the total payment information from your online account or your letter to accurately calculate your Recovery Rebate Credit. Updating the database of the Illinois Compiled Statutes (ILCS) is an ongoing process. To do this, fill out the Request for Change in Overpayment Recovery Rate form.