Yes, there is. It's right here. You already found it!
Alternatively, if it's a sensitive issue that you'd prefer not be discussed out in the open, you can email
firstname.lastname@example.org about it, citing all relevant details, and someone will contact you in private. The advantage of that versus raising another moderator flag is that it's guaranteed to be handled by one of the Stack Overflow employees, rather than a community-elected moderator.
But please remember: moderators are people, too. They sometimes make mistakes and/or have temporary lapses in judgement. Just because they were harsh with you once or made a decision that you disagree with doesn't mean that they're bad moderators, that they'll hold a grudge against you, or even that they'll make the same decision a second time.