Erick, you don't remember I told you, you have to go to console and type "status" then copy the first 3 numbers and do sm_votekick/sm_voteban. The player using 3rd party software to change their name will say something like: """
Ex: # 847 22 "=(e)= OogaBooga(Blix)" STEAM_1:0:155822602 00:18 41 0 active 524288
In this case, you would need to type sm_voteban 847 in console
PS: If you want to make a request ban form you need to copy the steam id above (STEAM_1:0:155822602)