I have had zero success, but I don't try very hard to get people to correct forms. I tried years ago, a few times, to get Fidelity to stop putting the code for early distribution on my late sixties age client. I gave up on that and just used Form 5329, exception to penalty on Line 2, and did the tax return correctly. That's my policy - just do the tax return correctly, and try to satisfy IRS matching as I go. Say for example, somebody puts a figure in 1099-Misc, Box 7 that they shouldn't have, I enter a figure as income on Sch C, then back it off with an explanation on p. 2. Then enter the figure wherever it should go. If my clients want to chase the issuer of an incorrect form, they can. I don't have time.