I had no involvement in your situation but I want to stress a few points. Permas are a problem and they do negatively impact other players so it is something that has to be taken seriously to maintain a consistent and level playing field.

Sharing an IP is a pretty big red flag, we have no way to confirm what you are saying and have to assume the worst because it can and has been abused in the past.

You have to understand as well this isn't a public service, if I have a slip and slide setup on my lawn and some kids come play and I think they're ruining fun for the other kids I can tell them to get off my lawn.

The idea is to maintain a competitive balance and perma-grouping drastically affects those balances and general fairness to other players.

Anyway, try to understand it from our point of view as immortals. All the best.