[mothered]

Chargeback with my branch.

the truth is that they do not have proof of delivery, but they do not seem to want to let me speak with a person of higher rank.

^ This Is what will support your claim If you decide to hit a chargeback.

I just called UPS and they indeed confirm that the investigation is still open until tomorrow. I have asked them to send me information to my email so that I can attach it to the claim. I think that when I have the report, I will continue to press TNF to see what they say, and if not, I am entitled to double the amount charged, at least where I live, for unjustifying the delay in the return without just cause.

Do you think it is a good option? The only thing that makes me doubt I think it may be the insecurity of the experience, but theoretically, everything fits. Thank you !

I think you've adopted a very good approach, that covers a lot of angles to maximize the claim In your favour.