Sometimes Seller support straight out says that they did not receive inventory, in this case use the inventory ledger using the FNKSU and attach the screen shots of the inventory receipts as evidence, highlight the shipment ID, Title and quantity. Sometimes Amazon is moving your stock in other FBA warehouses and your inventory gets lost. I know this is frustrating for all sellers but this is reality.

If you are unable to start an investigation just create a normal case yourself and provide evidence like an image of box, invoice, and inventory ledger receipt screenshot etc.

Go to Reports - Fulfilment by Amazon - select inventory ledger, to access it now you'll have proof if Amazon actually received the inventory or not for the case.

Link: https://sellercentral.amazon.co.uk/reportcentral/LEDGER_REPORT/0

If this does not work then I recommend emailing here: managingdirector@amazon.co.uk Include your case ID in the email so they have access to proof of purchase, your chat etc.

I was in a similar situation and my issue was resolved once I emailed the MD. I had provided in the case all the evidence; inventory ledger screens-shots, proof of purchase, and images of the cartons posted to FBA, and invoice etc.

Try it, you might be able to resolve your issue.

I'm leaving a sample format of the email below as well. It might be handy.

"

Subject: Inventory Missing - Shipment ID: 12334567 - Request for reimbursement or inventory resolution

Hi Managing Director - UK,

I hope this message finds you well. I am writing to address a significant discrepancy that has been identified in my recent shipment with the ID: FBA12345678. Despite my numerous attempts to communicate with the team, I have encountered an ongoing issue with receiving only automated responses stating that there is no record of the shipment being received. In an effort to provide comprehensive evidence, I have attached the invoice, box image, and Amazon fulfilment report from the inventory ledger. Despite submitting this supporting documentation, I continue to receive the same message, which has proven to be exceedingly frustrating and disheartening as an Amazon seller. These documents can be found on the case ID provided below.

Considering the impact that this discrepancy has on my business, I kindly request your urgent attention to this matter. I understand that addressing such issues requires thorough investigation and prompt resolution. I trust in your expertise and professionalism to resolve this matter promptly and provide me with a satisfactory explanation or clarification regarding the status of my shipment.

I appreciate your understanding of the urgency of this situation and your swift action in resolving this matter. If any further information or documentation is required from my end, please do not hesitate to let me know. I am committed to cooperating fully to ensure a timely resolution.

Thank you for your immediate attention to this matter. I look forward to receiving a prompt response and achieving a satisfactory resolution.

Sincerely,

Name/Company Name

Case ID: 12345"

I have copy and pasted it from my email, edit it according to your needs.

Good luck!