Amazon stealing inventory and re-selling it?! (NO, I’m not joking…)

Hello,
I have been having some highly concerning issues regarding FBA recently and within the past year. We have never had big issues with Amazon until around mid last year when we started noticing some abnormal losses to inventory where Amazon would only find HALF of the inventory and loose the rest. After fighting multiple claims successfully in 2022, I was told by multiple customer support reps stated that Amazon’s new send to Amazon process flow should fix a lot of this and it did… For only like 2 months and now that I am checking, we are again having MASSIVE issues. If Amazon holds us to around 1% error rate, Amazons current rate would likely me like 99% (No, I am not joking, its just THAT bad)
My biggest questions to the community is:
1. Amazon has marked a few of our inbounds as past 9 month period for opening a case, however there were disruptions to major parts of seller central due to the US INFORM CONSUMERS ACT popups etc and we had major issues with things crashing over and over. I was told by Amazon to just wait for a fee days and things would be resolved. I left things for a bit and was not checking as closely during this period (my fault) due to things not working at all, but when I came back, now I am faced with a few that were lapsed by just a few days.,.. We finally decided to wait and allow Amazon to sort out some of these issues, however a major case slipped into past-9-month period which I should have been more focused on, but had accessibility issues with the site and platform. Now Amazon says even though the 9-months of time they allowed was tainted with usability issues, we are unable to open any case on these shipments. Has anyone had any success with getting something like this resolved? We are talking close to 10,000 units lost or more.
Amazon has since lost thousands of LBS of product and we never ship things incorrectly and have a way below 1% error rate for our shipping issues on our end. The rate at which things seem to get lost is TERRIBLE. We are talking 2000-3000 units just GONE. This keeps happening and in 2022, we received reimbursements for over 15,000+ units lost due to Amazon just “loosing” it at their warehouses.
2. Among the 10,000+ units apparently lost and not attributed to our inventory, many of them were a certain product that we are now seeing being SOLD by Amazon themselves. Our company currently does NOT sell to Amazon Vendor in any way, so we KNOW that they somehow found/stole this inventory and are now selling it without compensating us at all.
So I guess in the end, is there any way to get ahold of anyone to get help with a past 9-month larger issue inbound? Has anyone filed a lawsuit against Amazon for reselling their inventory which was taken from our seller-only inventory?
These seem to be some horrifying issues with Amazon and I have inbounds with Amazon mis-matches of over 2000 units each in over 10 other inbounds this year that I am fighting within the 9-month period.
This is highly frustrating and I am seriously wondering if something fishy is going on with Amazon? Is someone stealing our inventory, is Amazon stealing our inventory? What in the world could be going on?!

Has this happened to anyone else before with a positive resolution or outcome past 9-months? Or also has anyone had their own inventory show up as “Sold by Amazon, Shipped by Amazon” after not EVER selling any of this same “X” inventory to Amazon previously? SO crazy!!
Any help is greatly appreciated!