Complaint is being ignored after passing the buck!

Recently I complained about the Bluetooth playback on my Renault Duster 4X4. After a lot of noise they finally replaced the unit with a used unit and the problem still existed. George branch told me to contact Renault SA. I have been sending messages since Friday and still no response. I have never seen people buck the issue like these guys do! The manager at George got highly offended when I swore in his presence, and told me to leave his premises. I paid their asking price for the vehicle, I expect everything to work as it should. I have tried two iPhones, one Samsung, a iPad and a iPod and they all have interference on playback. The menu navigation also jumps back to the root directory if you try to replay a song. (It completely leaves the album) All these items work well on my wives Renault (Sandero Stepway) and well as on the Sony system in my NP200.<br> <br> I have kept the responses to my emails and will not talk to anybody at George Renault without a witness again.