I have no clue of your specific situation, but I can certainly understand the frustration. IP change are detrimental for a community. Server owners works hard to buildup their ranking and playerbase and when the IP are changing they basically have to start all over again and depending of the game it can be really hard to recover. I remember about 10 years ago I was hosting CS:S servers and the host I was using moved their data center which resulted into new IPs for us and we lost over half of our population just like that since our servers were no longer being favorited by anyone and they had to manually search for them. Anyways, you should contact support and ask them what did happens and if routing back your old addresses is a possibility. Good luck!