Urgent Help : losing all my inventory

I purchased 400 units off alibaba and the supplier sent the inventory to Amazon warehouse ( FBA inventory) . At first amazon flagged my items as hazardous and I uploaded a safety data sheet. Then it said there was discrepancy and they received 0 inventory!! Now I need to upload proof of ownership, the supplier says alibab has record of order and I don’t know what to do or how to extract the proof of order.

The supplier is a secondary supplier not the manufacturer so I am even more worried about how to get him to create a valid proof for my purchase. Should I get a refund if the supplier can not provide proof of purchase?

I really don’t want to lose my inventory.