b) don't look like you are trying to take the conversation out of the community space it's happening in and/or hiding details by going to a private call (you can offer a call, but it shouldn't be the expectation)
c) Acknowledge the concrete complaints made. Are you truly "struggling to understand" what someone means when they complain that it didn't happen in a staging environment first?
d) a-c also lead to "don't sound like any cookie-cutter PR response to a complaint ever, people have learned those are not genuine". Especially if you are a project that makes a big deal out of its community interacting with said community.
e) ideally announce some concrete first step, e.g. pausing the bot