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There's really nothing to fix. They are doing the correct thing by sending you 1099s (not W9s).
This doesn't cause you any problem as the costs of all those supplies, printing & postage are expenses that you deduct on your Schedule C when you report for income tax purposes. So, those expenses will offset the portion of those items that have been included on your 1099; you only include the NET income on the Schedule C in your taxable income.
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