[Kikibosum]

No matter how many times I call back and tell them everything you tell me, it's always the same thing, they can't do anything. I even told them that given the reputation on some online review sites with this recurring problem, I will contribute to these bad reviews but they don't care.

They don't know how to respond to your questions and requests, hence they come up with the same BS that's clearly not justified.

Do you actually contact them by phone?

I opened a claim with UPS by checking the box: "Marked delivered but never received" and not "The signature does not belong to me". I'm sticking to the so-called NB version.

Good.

If UPS tries to dispute the signature, rest assured, we'll tackle It effectively.

Yes, I did contact them by phone. Twice and twice the same answers. In fact, they know that my request was taken by one of their colleagues and they all line up to say the same answer.
Thanks for your help, I'll update here when I get an answer from UPS