CCTV Audio Dialogue Enhancement

I have a single 20-minute CCTV recording where spoken words are hard to make out. My priority is dialogue clarity—background hum, traffic rumble, and any other noise that masks the voices all need to be pulled down so the conversation is intelligible without introducing artifacts... (Budget: $30 - $250 USD, Jobs: Adobe Audition, Audio Editing, Audio Engineering, Audio Production, Audio Services, Sound Design, Video Editing, Voice Talent)