You get this from IRS, they issue the 147c letter.
The IRS has a business line, which is toll free, at 1-***-***-****. You need to have the EIN or TIN number number ready so they are able to get the correct information. It is also possible to write in for a request, but this is uncommon since most people don't wish to wait around for the IRS to answer its mail, as they are already subject to a 28% penalty today.
Remember, a 147c letter is there to show you what the IRS already has on file. If this information is incorrect, or the business entity name in the IRS file is wrong, it is up to you to get this information fixed, or change the name of your business everywhere else to match the IRS, which is not recommended since you will be getting information requests for years about alternate DBA names for your business.
Give them a call here, IRS can get you the letter you need.
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