I have received an IP complaint.

I hunted a product and sourced it directly from the brand. At that time, the listing was under a specific brand name, but now the brand name on the listing has changed, and I have received an IP complaint.

I have the brand invoice, which I have already submitted, but in this situation, what should I do?

I have received my first ever IP complaint from brand I am ungated with and sell their products, that brand is alleging that my products are counterfeit, they have made this claim without ever even seeing my product, I believe it was a automated system through greyscout.

I had bought this item in person from a TJMAXX brick and mortar store, and only have the physical receipt. I have submitted pictures of this receipt and of the product, only to be denied. My account health has been affected and I'm not to sure what else to do.

Amazon says I need:

A invoice (I do not have, I only have the physical receipt)

A letter of authorization saying I can sell this brand dated before the IP complaint (don't have either)

To have the brand drop the IP complaint, I have sent an email to the company but haven't gotten a response, what do I do?

"We suspect that the listed item may be a materially different product and potentially infringing our IP.."

I had inventory that has been suppressed due to an IP Complaint. I submitted the documentation and it was denied. I want to get my inventory back and cannot place a removal order. But now I am being charged warehouse storage fees. How can I get the inventory back or stop getting charged for warehouse storage?