Hi, and welcome to the community!
I suggest you submit an online contact form; and someone at Spotify should be able to make sure you don't get charged again. They can also, if necessary, provide a refund provided sufficient evidence is found or provided to prove you were charged wrongly.
If you get an automated reply; make sure to reply to it directly (even if it's from a no reply); and it will be sent to the Spotify staff.
Anthony 🙂
Hey there you, Yeah, you! 😁 Welcome - we're glad you joined the Spotify Community! While you here, let's have a fun game…