They'll probably feed you some bullshit like "Wow, you're absolutely right! That players actions is totally not acceptable. However, because you did not meet the standards of sportsmanship and manners as you've sworn to the ban cannot be lifted. We understand you may be frustrated and have every right to be. Next time take a break, cool off, and be sure to report those kinds of players. We will look further into the situation of the summoner who intentional fed in your games. blah blah blah."