Please note that you don't have an account with Xsolla. However, you may have subscriptions set up for services such as Twitch.tv, FACEIT, or Xsplit. These subscriptions can be cancelled from their respective accounts.
If you see a charge for Xsolla, it means that your payment account was used to pay for a game account. For example, you may also see Roblox, Epic Games, Twitch, Ubisofot or EFT in the description of the charge. That means the payment was made through Xsolla for this game.