I did not give out my ok for the 19.98 to be bill to me for anything. i need for you to put it back in my account

I was billed 19.98 on my card and I don't buy anything from you for any reason. I would like it back in my bank asap. I have no idea what it's even for. I would never spend that much on a game or music or anything else. I have no idea what its for, it doesn't say on my bank notice.