A story about the resurrection of the dead in our time and a question about the halachic implications

A while ago, my brother called me and in a voice filled with sadness told me about a certain person (whom we knew and respected) who had passed away.
For proof, he sent me an article from the website Haderei Haredim about his death and the times of comforting mourners.
He couldn’t come to comfort me, but he encouraged me to go.
I drove to that city, entered the neighborhood, saw obituaries at the entrance, and suddenly there were a lot of notices on a certain house.
I assumed it was the place of the mourners and went up to comfort them (I knew he lived on a different street, but maybe he had moved into the neighborhood in the decades I hadn’t visited?)
I sat down to comfort him (I was a little surprised that I didn’t know the mourners…) and began to tell him wonderful (true) stories in his praise, but the mourners stirred uncomfortably…
Suddenly it turned out that I had probably come to comfort someone else, and Teri Reuven ben Yaakov was in the same neighborhood…
And I didn’t know the dead person at all… I’m talking about someone else…
The mourners began to laugh, and I, out of shame for my stupidity, did ‘and run away’. Outside, I hear the mourners bursting with laughter at the gnome who was here a moment ago…
 
Probably because I was so traumatized by the joke my brother made on me…
I refused to think logically and for some reason I assumed that there were indeed 2 Reuben ben Yaakov in the same neighborhood and 2 died…
fact…
I saw an explicit article in my room…
 
I went to the address of the well-known and familiar Reuven Ben Yaakov to comfort him…
Of course, I was ridiculed and mocked for coming to comfort a living, healthy, and fully erect person…
I got back in the car and called my brother, who to this day claims that he did so in good faith and did not think that 2 Reuven ben Yaakov lived there and that no plot came to his mind, and what’s more, he didn’t come with me to comfort him because he was busy…
 
1. Should my brother apologize and pay the fare?
2. Did I somehow fulfill the commandment of comforting the mourners, since they roared with laughter at the idiot who was with them a moment ago?