[Ahriman]

Hello, My server was host to his serious attacks have to change. Vandal resistant host company Can you suggest?

[DaRealShazz]

I'm guessing you are talking about DDOS attacks.
Get a DDOS protected dedicated server or a VPS from a reputable company (will cost significantly more).

[Ace155]

I'd say go with https://www.ovh.co.uk/anti-ddos/ if you don't have the money for a really good one.