If you cannot get the company to void the form which was sent to you, then you will need to attach a statement to your tax return, explaining to the IRS that you were issued a 1099 form for money that you never received, and explain that is why you have not included that amount on your tax return. Include a copy of the 1099 form for their reference.
Once your return is received, the IRS will send correspondence to the company asking for further detail on why this form was issued. If they firm can show where payment was made to you, then you will still be liable for the tax on that amount, otherwise the IRS will request that the firm void the form.
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