If the account can reasonably be considered to be abusive (whether intentionally or because it was compromised), DigitalOcean has an even greater obligation to protect their network and the other network that's being targeted. Immediately suspending the account is the correct first step.

If DigitalOcean's support wasn't clear about their reasons for suspending the account, or if you feel that you weren't getting a helpful response from them, then post the communications you had with them to prove it.