Clear Audio Enhancement for Ringcam

I need to enhance the audio and isolate voices on about 6 Ringcam recordings. I want this to be confidential as it involves infidelity, the goal is to make phone conversations inside my house between my... (Budget: $10 - $30 AUD, Jobs: Audio Editing, Audio Engineering, Audio Mastering, Audio Processing, Audio Production, Audio Services, Music, Sound Design, Sound Effects)