I got a couple of websites hosted with them which were hacked as well. They suspended the sites and sent me an email with what needed to be fixed which I easily addressed and had the sites back again in a few hours. While I'm NOT vouching for them as a good hosting service, they took care of this quite professionally to be honest.
They pointed me to where the issues are, and never asked me to get any additional service whatsoever. Funnily, most issues actually came from a security service they are promoting themselves, so who knows, I wouldn't be surprised if that's a new shady trend in the web hosting business. Or the other option, which sounds more reasonable is that you're doing some dodgy stuff, otherwise I can't see a reason why they wouldn't reinstate your websites.