Can understand how to contact support on a stolen account

Hello,

A relative of mine got tangled into another person's paypal account, so now my relative receives activity info on email. We can't contact the other person, as they are not in good terms at the moment.

The bigger problem though, is that the email of my relative appears to be an active account, but when trying to login, there is 2FA tied to another phone number that we do not recognize. The best I can get from my relative is "I think I got hacked long ago". But I want to get the account back, or in worst case close it, so it would not be part of any shenanigans.

I have my own paypal, so I tried to see if I can contact support, but either it appears to be quite convoluted, or it wants me to LOGIN, so I can explain my case (even though paypal states that it will not disclose info outside of my account).

Oh, I'm also in Europe, Bulgaria. Local CS number points to some service that is not related to paypal (lol).

Any suggestions on how to proceed? What is the tried and true way of contacting someone on paypal side to explain at least how to proceed?