probably bot/rmt/others investigation too. if you are clean then dont worry about it. be patience
I think botting, RMT, etc receive a 2067(?) perma-ban. A 2020 ban is actually a temp-ban for minor stuff like grieving. It might be a case where someone may have attempted to hijack your account as well. Just wait for an answer to your ticket. No one here (except a GM) can really help you much.
BTW, yes, spamming DBs just to kill others is considered grieving. It's one of the main reasons why people complain and DBs have a cooldown now. So unless you plan on killing them, don't spam DBs. If someone accidentally dies, it's not a big deal. But killing people intentionally isn't okay.