you can but you cannot have your xp turned off. the xp elimimator npc is bugged if you do not have game time, so you gotta ask a gm to give you some if you dont wanna spend money or wowtoken
Ask a gm for game time so you can collect gold from your "friend who wants to pay for your game token." They'll give you like a day of time and during that time, turn your xp on, wait for your gametime to run out and you should be good.
To re-tell what others already shared: you'll need to ticket support, and ask them to help you fix this issue through turning xp-locked to xp-on on your affected characters that were xp-locked before your subscription ended. Apparently some GMs may give you a brief window of game-time to do that. Others (especially if you're detailed enough in your ticket) can do the xp-locked to xp-on change for you (and thus enable to que for instanced pvp again).