Your English is very good. Way better than my Spanish!
It looks like you suffered the extremely bad luck of either an internet drop-out locally, or more likely (because your friend also saw it), a server hang-up and reset. This can happen and sadly for you, at the worst possible time. Chances are that penalty went down on record as missed and you ended up losing. You could contact Support but other than perhaps a few tokens compensation, you’ll have to grit your teeth, maybe cry a bit then move on. Many of us have experienced this but not so many I guess in the biggest game of all. Bad luck dude.