AWD Warehouse won't return my refused product

I sent product to AWD after Amazon pushed it heavily. Big mistake. I shipped it exactly as I send it to FBA warehouses not realizing they have special packaging requirements so they refused to intake my product into inventory but have been holding it since January. I've tried to no avail to have it forwarded (at my own cost) to FBA warehouses or to let me have a partnered carrier pick it back up but have gotten almost nowhere. One time they said I could send a carrier to pick it up using an ID (code) they gave me but when the carrier got there they refused to allow them in, stating the ID wasn't anything they recognized. We tried all the original shipment IDs as well and nothing.

Since then the only thing they'll tell me is essentially 'we're waiting to hear back from the warehouse.' It's tens of thousands of dollars of inventory tied up for nearly 6 months and I'm getting absolutely nowhere. Any advice on legal representation or how to get my product back because Amazon doesn't seem willing to help in any way. And I've tried requesting to escalate it but that's not something they do.