Hello!

Are you playing from a newly opened server (not more than 50 days old)? If yes then the opponent that you are facing in Arena was a player from your server also. Then the possibility of having him/her as your enemy every time you queue for a match is high. Some of the events that newly opened servers that have not more than 50 days old aren't cross-server yet so, that's the reason. Another thing that I noticed from your statement, you said "I cannot meet my other account", as far as I remember, using ạn alt account to gain something for one account is prohibited so be careful saying that here.