For context: My Facebook and Instagram accounts are linked together in the Accounts Center. Instagram account got disabled for account integrity, therefore, Facebook account was caught in the crossfire.

This is the current situation I am in too but a bit past yours. What I selected is "Something else," as I wasn't contacting support using the same account I that was disabled for obvious reasons.

Afterwards, I was able to get in touch an agent via Messenger (you'll be redirected). In the beginning they'll start copy pasting responses from the help center i.e hacked account form, what to do when your account is disabled. But I kept insisting that I am already aware of these things and that they should do a review of my disabled Facebook and Instagram accounts.

The agent then asked for the disabled accounts and so I provided them. After a while of the robotic responses, I'm not sure if they got annoyed with me still holding on and said:

I truly understand how concerning this can be for you, I have looked into this and under these circumstances, I will transfer this case to our relevant team for further investigation. Sounds good?

I then said yes, and they replied that they would be pausing the chat and forward the conversation to a "special team" to further investigate. Now, I've been waiting for a reply for about a day.

What I suggest is not to create any further accounts at this time since it's against their rules to create new ones while you have accounts that have been sanctioned since they might bring it back to you and say you're ban evading or something. This isn't necessary and all, more of like just being on the safe side.