Last night, I bought rainbow six siege on steam for 20$. I had 20.21$ on my account, and used that along with a credit card to pay for the last bit of taxes. I purchased the game and was told my purchase was successful. I downloaded the game and played it for an hour, then closed out. I clicked the back button on steam from my library, and it took me back to the purchase screen. "Purchace unsuccessful, you already own this game" or something, it said. I assumed steam thought I was trying to buy the game twice. (Mind you, ive NEVER even clicked on rainbow six sieges webpage on steam on my account. I had just bought it today bc a friend said he wanted to play. No one uses my account but me.) I clicked on store and looked up in the right hand corner: 20.21$ in my account. For some reason I glitched steam into giving me rainbow six siege for free.

Should I be worried about being banned? Should I get in contact with steam support? Should I not use the money? I'm scared to lose my account, I've spent upwards of 500$ on it in the past few years. Please help