Listing Blocked - used sold as new- Appeal Help

Could you please give me some advice about appealing blocked product ?
Reason : Used sold as new

We are manufacturer and the brand owner of cosmetic gel.
One of our customers complained that he has received used bottle of gel.
Asin was fullfiled by us and Amazon - I have no idea what sort of fulfillment was used for this particular order.
Amazon blocked the ASIN.

This is my appeal :

Dear Amazon Team

I am writing in regards to recent blocking of our listing for the product: ABC , ASIN: ABC

As I learned from your report, there was a customer complain, who received used product instead of new. I have investigated and analysed all the possibilities how the problem have occurred and have tracked our supply chain for the possible mix up.

We are using FBA service and also fulfill items by ourselves.

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POSSIBLE CAUSE: Items might have been mixed up in FBA centre when accepting customer returns and used item was classified as in sealable condition instead of damaged /unsellable.
SOLUTION: We have applied permanent seal to the packaging to avoid possible mix up when dealing with customer returns in FBA. The seal will need to be destroyed when unpacking the product so it will be clearly visible in the case the item will be returned by customer to FBA centre.

POSSIBLE CAUSE: Used or faulty items were send to FBA centre.
SOLUTION 1: We have implemented a new Quality Control procedure to double-check each and every product before shipment is made to FBA centre, to ensure that every single item is properly inspected for any faults and the presence of permanent seal.
SOLUTION 2: We will be disposing of all returned items immediately from now on, to ensure that no mixing of new and used items occur in the future.

POSSIBLE CAUSE: Item was fulfilled directly by our site and we have send customer return as new item to the new customer.
SOLUTION 1: We will be disposing of all returned items immediately from now on, to ensure that no mixing of new and used items occur in the future.
SOLUTION 2: We have implemented a new Quality Control procedure to double-check each and every product before shipment is made, to ensure that every single item is properly inspected for any faults.

POSSIBLE CAUSE: Faulty item arrived from the production line and the bottle was not filled up to the top.
SOLUTION: Additional working associate will inspect all the incoming stock from production line and check it for any faults.

POSSIBLE CAUSE: Item fulfilled by us might have been damaged during the transit and customer regarded this as in used condition.
SOLUTION: We have implemented new secure and shock resistant type of packaging to make sure that no item will be damaged during the shipment.

I would be grateful if you could remove selling restriction. We believe that we already have appropriate policy in place, and with additional processes above we will prevent similar problems in the future.