That’s so ridiculous. I bet the warning didn’t even tell you that you couldn’t use another account in the interim.

They don’t seem interested in unbanning these kinds of banned. You can get around it, but they need to have no idea it’s you. There are posts and videos about it. It’s checking your devices and your internet service. You’ll need a new device and internet service. You can never connect your old accounts to them, and you can never log the new device/account into an internet service you used (eg. at your moms). It’s also recommended to take care to not make it obvious you’re the same person. Eg. spend a few weeks just upvoting posts, only go to a few subreddits you didn’t go to before, and slowly add the stuff you liked before.

I’m not bothering, personally.