Impossible to happen

It does look like a DDoS attack. unfortunately, those hits are still counted whether they are malicious or legitimate traffic, as they consume server resources. So your account cannot be reactivated. You will need to wait for the tempoary suspension to be lifted and hope that the attack does not resume. To prevent most attacks like this in future, you can use Cloudflare for protection. However, please note that this only works if you are using a custom domain; Cloudflare does not support the free subdomains provided by us.