The hours of operation are 7 a.m. The only two ways to get an EIN Verification Letter (147C) is to call the IRS at 1-800-829-4933, or to mail the IRS a written request.However, you will need Adobe Reader installed if you would like to receive a confirmation letter online. Click here to print and complete the appropriate Business Certificate form using black ink only. This confirmation letter is known as Form CP 575 and is mailed to the address mentioned in your Form SS-4 application. This EIN confirmation letter is called CP 575, and the IRS only mails the letter to the mailing address listed on line 4 of the SS-4 application. You must have a General Vendor license to sell, lease, or offer to sell or lease goods or services in a public place that is not a store. I submitted my application; however, I didn't receive an email confirmation with my assigned case number. Age UK is the leading charity for older people. Visit Age UK today for help, information and advice or to see how you can donate or give support.