I'm not sure why the Antique Market would issue you a Form 1099-NEC as I assume it reports the rent you paid to them for the booth you rented. If so and you can't get them to correct the form, you can report it as sales on your business schedule C and then enter an expense for the same amount, called mis-reported sales or something similar, to cancel out the income.
If you mean somehow they reported the sales income you received from the antiques you sell, then the form would be correct and you should enter that as part or all of the sales you had during the year.