Deal with it your punishment is 9 days mute right? Then if they didn't give you a chance on your appeal then wait 9 days till the mute gets expired, Bro I waited for 5 years so I can play again.
The best thing you can do is to ask the owner of that netcafe to change his Client/Administrator system idk what is the right term of that but i'm pretty sure all internet cafe owner knows that or CCboot, so all the pc there will have seperate serials and not connected to the netcafe server serial the administrator server rather, the mute is not on the pc where you played the mute goes to the main netcafe server that's why all PC there gets mute too ask that to the owner, so the nxt time you will get mute all pc there won't get affected again and it will only issue in the PC where you played and get punish.
Hope it helps