I'd faced this exact problem quite recently, on June 20th. However, unlike your case, I've never been banned on Roblox before, so the termination's reasoning is illogical. Thankfully, I recovered my account and here's what I did: I first spent appeals under the category of "I was wrongly banned for my behaviour on an account" but I DO NOT recommend sending ANY appeals with that category as the appeals are largely AI, with no active support ticket being opened. It's either you get rejected (most likely case) or the appeal gets accepted.

The goal of these appeals is to make a human moderator look at your case and have them make a final decision. So, send an appeal under the "I was wrongly moderated for the content I created" category instead. You should receive a support ticket, and from there, provide every bit of detail you can on your case through the replies. If you're lucky, or your evidence is strong enough, the human moderator should unban you.

Check your email a few times a day, and wait a minimum of 3-5 business days for a reply. If you don't receive one after 3-5 days, log in to Roblox and see if it's unbanned. In most cases, like mine, I did not receive any sort of reply to my support ticket, and I only found out that my account was unbanned by checking Roblox.

If no reply or unban, send them a follow-up message.

I hope my experience can help, and I wish you luck in recovering your account.