Trouble with product approval even though I have all their requirements

I’m getting a bit frustrated. I’ve been selling on amazon for a few months and am pretty familiar with the ungating process by now. I have been denied on multiple times with this one category, and now have thousands in inventory that I cannot sell. I’ve given them an invoice that meets all their requirements, given pictures of the product, provided them with UPC codes, ASIN codes, and now I’m at a loss of what to do. Does anyone have any advice on how to push this through?