Someone made a listing with my GTIN and now my product description text won’t change for some reason.

Last week I created my seller account to sell my own product. This is a product that I created and sell through my own website / company / brand. When I went through the process of adding the product and adding my GTIN number, the system informed me there was already a listing for my product with this GTIN (but it wasn’t available to purchase). So that listing reverted to my control. All good. The product description text described my product, but not the way I want, and it’s missing important info and some info is wrong. I have submitted a new text description into the listing last week, but it will not update. So my questions:

1. How can I get the text to update to what I’ve submitted?

2. Who created this listing for my product with my GTIN? Any way to tell?