You have been the victim of identity theft. You need to contact the company that issued you the 1099-B and let them know that. You also will need to handle this with the IRS. The IRS has received that 1099-B as well and they are expecting it to be included on your taxes. If you file without it they will send you a letter asking about the extra income. You should plan to mail in your tax return this year with a letter explaining the situation and letting them know what's going on.
The IRS has a lot of resources to help with identity theft. Check them out here.
You should also consider requesting that the IRS issue you an identity protection PIN.
@tbyrdjenkins999
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