Call Yahoo! at 1-408-349-1572 and listen carefully to the automated response and choose the "for Password or Yahoo account related concerns" and explain to the representative what happened prior to you getting barred till Dec 2020 and hope they will unban your account.
If they don't then only thing left to do is create a new account.
im baffeled how i got barred last night i went to another room came back and was barred all i know is the last guy i played ci_provo_1_volta must not had liked getting beat and get this he had already beat me 6 times so he took of signed out of the room and i was barred for 24hours he must have reported me for something that is my thinking and if yahoo barred me that is slack cause evry player who does play pool swear and talk disgusting and tease each other i admit im no saint but the gestures words that some people use and espically towards our mothers and let s just remember this is a game of fun. anyway if i was wrong or done something i need yahoo to explain.