Just purchased Audi A3 Sportback and would love to here music from phone. Want to spend as little as possible hooking up iPhone and Spotify with car although cable purchased doesn’t seem to fit. So do I need a new system or is a cable required? If a new system is required could you recommend? Also Bluetooth system appears to have been installed for phone with microphone above courtesy light and cannot hear any sound from rear speakers despite using Tone and Fade options. Any info greatfully received.