FBM orders from FBA listing continues........What can I do?

I keep getting FBM orders from FBA only listings. This is the 6th such order in last 8 weeks.

When I call it in, Amazon keeps saying the same 3 things:

1) Your inventory feeds are messed up (No, I have never used a feed in 16+ years on Amazon)

2) Your 3rd party software is causing this issue ( No, I turned off all my 3rd party software just to test this theory)

3) Well...whatever you did or did not do, when the buyer bought it, FBM listing was active (No- that is not possible. Once or twice, maybe, but not 6x in 2 months. And there is no way for me to prove or disprove this accusation).

The problem is that no matter what I do, when this happens, Amazon will simply say "When they bought it, there was a FBM listing for it". They will never take responsibility for their system issues. I can turn on my Vacation Setting. I can delete ALL my FBM listings (less than 0.01% of my listings are FBM). But even if I do all these, if it happens again, Amazon will simply say "its your fault". Further, I can not simply cancel the orders because it will cause problems for my account health score.

So......... What can I do about this? This will continue to happen and Im afraid my account will eventually get suspended because of these. Amazon is refusing to cancel the orders on my behalf.