Not sure if is a coincidence or not but I messed up on my 7th game as well. Personally I highly doubt Top Eleven would go that far especially when you can exploit the system for that task.

The way I've done it, I used my subs as a 2nd team and played 7 friendly game and got it. I just played against a friend who is much lower in level (1star) x7 times and got it. I recommend you do the same as is a legit thing to do.

With the rest, is the magic factor that is in the game, hard to fight against.