A customer return was sanctioned by Amazon and shipped by Evri.

Evri contacted me to tell me the return was damaged and is undeliverable. They told me to contact Amazon MFN Tier 5.

I tried seller support who have told me various things none of which are relevant to the case (as ever), one telling me to submit a POA for my SFP Performance Rate (it's 100%!) and another telling me that the parcel is undeliverable and I should contact the customer. I can't submit a Safe-T claim, even if that's applicable, as I've refunded the customer. I don't have an Evri account and rarely use them.

Anyone know how to contact Amazon MFN Tier 5 as I've not yet found anyone at Amazon who knows what it is?

As it's Amazon, and I value what's left of my sanity, I'm happy to let it go but just asking in case I'm missing something.