No response or Feedback

Last week Myself and my wife went to look for a vehicle. We did some enquiries with a Salesman. Gave him our details and was told they will be in touch after seeing our trade in vehicle and trying to get the best trade in price. Ever since its as if we had to do all the calling for feedback on the progress. Even after sending all my wife's details , payslip etc... we always had to call them for feedback. After we got a figure for our car as trade in we waited on the Salesman to call us to explain what vehicles he had on offer so we could decide. I called again to ask for progress and even then I was told end of business that day they or he would call us with some response or feed back. Friday past, two days after the previous call we made we called yet again. I asked progress again and I said I was told two days ago I would receive some type of feedback. I was then asked my phone number to confirm and that yet again they would call back asap. NO CALL AGAIN. The before sales service is this Shoddy how will the after sales service BE!!! This is the second time Mercedes has been this unprofessional .Never again.