You are correct, the payer is required to report gross payment card and third-party network transaction amounts to the IRS. See this IRS FAQ for more information.
Contact the payer regarding any issues with your Form 1099-K. If you confirm that they reported the net instead of the gross, and they won't issue a corrected form, you can report the amount shown on the Form 1099-K; then, report the fees separately as other income not reported on a form and take a deduction for the fees paid. That way, your income reported from a Form 1099-K will match what was reported to the IRS so that their matching system doesn't show a discrepancy.
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