OK, new chapter for the novel... yesterday later after I make the last post the cable guy showed up here and said that the installation wouldn't be able to be done because my house is 500m away from the distribution box and the company puts the limit to 300m.
First I thought that the guy was trying to stiff me to see if I would bribe him (sometimes things only works this way here in Brasil), but soon I noticed that he was just a rule follower and that does strictly what is in the manual. Then he explained that the problem was about the cost of the fiber optic cable, etc, so I thought again that he wanted money and I told him that I could pay for the extra cable and then he sustained that it wouldn't be possible, yadah, yadah, yadah.
After I insist a lot he decided to call his manager at the office and left the mobile in the loudspeaker so I could hear the conversation. He explained the situation and at first the manager confirmed that it wouldn't be possible.
I was already running out of hope when after some talk the manager changed his mind and said that if I could pay $1 for each extra meter of cable (around $200 total) it probably could be done. Jesus, why don't say it right in the bat? Go figure.
After a lot of useless blabber they promised to have an answer to my case today (what I doubt). Since tomorrow is Holiday it will certainly be pushed to Monday when I will have to go their office, find the manager guy and tell him the whole story again to refresh his mind clouded by the weekend beer. Oh my!
In the meantime I go on using the 4G modem (that I still didn't discard the possibility of keep using it forever if the cable thing fails). Good news is that I figured that there is another possible option: there is a small company in town that I wasn't aware of and that offers the same service I had before (radio) whose antenna is right in front of me that I can see with a bare eye a few kilometers away. Actually it looks like to be the same antenna the other company used to send me their radio signal. Not as good as fiber optic but probably better than the 4G.
So my peregrination towards the Internet temple continues...