No longer eligible for featured offer on any of my inventory

I started selling on Amazon in mid April and things were going great. Focusing on wholesale and OA. I was able to make £15000 in sales in my first month, with £3000 of that being profit.

Everything was going great until I received a message from a customer questioning the authenticity of the item I had sold her. Her reasoning for this was that she “ran the batch codes” and it didn’t show up as authentic. I politely replied and said she could return the item to Amazon if she wasn’t happy with her purchase and also explained that the item was purchased from an authorised distributor within the UK so it was definitely genuine.

A few days later I get my first authenticity complaint from the same customer. Wasn’t particularly worried as I purchased this item in bulk from a wholsaler and I have all the documents needed to dispute the complaint. I also suspect that this is not a genuine complaint as there is no way to check the batch codes on this particular item.

Amazon then reject my invoice twice due to what I am guessing is sheer incompetence and laziness. Everything that is supposed to be on this invoice is there but you know how seller support is. Absolutely useless at the best of times.

A few days later I then get another authenticity complaint for a different item that was purchased from the same wholesaler in the same order. Again I know for sure that these items are genuine.

So I submit the same invoice for the second complaint and it’s rejected again. Now I request a call from account health and after speaking to 4 people I finally get someone that recognises the invoice is correct and they submit it to the secondary team to verify.

The following day all of my asins become ineligible for the featured offer. I have no other complaints or issues on my account so I am guessing it stems from the 2 authenticity complains.

It has now been 10 days since this happened and I have gone from making £1000+ in sales every day to pretty much £0. I have called every day and I am told all I can do is wait with no indication of how long this all may take.

It blows my mind that Amazon think this is an acceptable way to treat sellers. I have sold 1600 items and received 2 complaints and they pretty much shut my entire account down with no urgency to resolve the issue and no explanation as to why this is even happening.

Has anyone dealt with something similar and if so can you offer any advice on getting it resolved? I am guessing as Amazon don’t employ me directly I am not eligible for any loss of earnings or compensation. Was feeling really positive about Amazon before this but knowing you can do everything right and be treated like this is giving me serious doubts about investing any further.