Rreturn item delivered at 11:32 , buyer "filed" an AtoZ claim at 12:01, I refunded seconds later, AtoZ granted against me?! and defect recorded

Just called Amazon (again) as they refuse to reverse the defect, the buyer insists he didn't want to file an AtoZ ... here is his message to me ....

"Hello, sorry I didn’t want to. I had asked Amazon to see when it was delivered back to you and without me asking he said he had file the AtoZ for me for the refund. I think it was a language barrier"

Amazon insisted to me that they don't file AtoZ on behalf of customers which is untrue as they had done it for me in the past, I asked them to check the messages on Amazon

ALL the customers messages have now disappeared from Amazon .............

I've been receiving numerous messages from customers over the past few months indicating that Amazon is notifying them about items being lost or delayed, even after the parcels have been delivered. While some customers are honest, not all are, and they're requesting refunds based on these messages. As you know, if a customer files a false A-to-Z claim, Amazon often takes my funds without hesitation. This is followed by the usual frustrating customer support response when I raise concerns. I genuinely feel at a disadvantage in this situation.

Does anyone know how to disable automated courier notifications/tracking links to buyers when selling as MFA? We can't turn them off with our courier, but also can't see how to disable the messages being sent to Amazon customers. Thanks