your server seems reachable through a ping.
If I understand well the situation it seems that they suggest you to acquiert your own IP address to have your own @abuse contact. I think a lot of guys report your ip to @abuse (managed by OVH, not you) about spam that why OVH react.
However in that type of case, OVH swap your boot to a rescue mode : https://docs.ovh.com/gb/en/dedicated/ovh-rescue/
You should be able to swap it to a normal boot mode.