I went in to check on my car feeling like I was t...

I went in to check on my car feeling like I was touching the brakes when I wasn't and car acting odd. (on 7/5)They got me in pretty quickly and even the man I spoke with was very nice when I dropped the car off. They told me it would just take 1 day to check over it and would call me. Later that evening after not getting a call yet and needing to know if I need to plan someone to get me and my son or just take me back to Nissan I called him. No one answered so left a voicemail and even explained why i needed to know soon as possible and that I get off at 4:30. They called around 4:30-5pm telling me they want to keep it over night so it can be sitting all night and see if it still does that. They told me they did feel what i was talking about once but only at some speed. Got my car when got off next day and they was unsure and can't take the car to that high speeds. So i paid them and went on way and understood. But as I was driving home I started to hear a rattle noise coming from my dash area(i think that area) sound as if something was in that area rattling around but again I could be wrong on area. Called Nissan next morning to tell him this new issue that has never been a issue until now and even he said never got that sound in my car even on higher speeds and just starting the car at low. Which it does make the sound on lower speeds. He told me to bring the car back and they will look at it. (set me back up for 7/12) So once again I am without my car and depend on it a lot. I was just dealt with the flood and lost my car and everything and depended on people everyday and finally thought I was back to a new normal.So once again did not hear from anyone and had to leave voicemail and when he called me back he said the voicemail system isn't set up yet and didn't know I called. But once I did get the final call and went there I was told they are unsure what is making the sound but they do hear it also and would have to take my dash off to see and they do not have the time and would cost a lot to do so. Told him it never ever made this sound until they had it but we just went around and around. I have emailed and called few emails and numbers to try to get help with this but have got nothing at all back! Even filled out all the surveys to receive nothing back! I used to tell everyone how great a company Nissan is but after this I make sure to tell them how thanks to them my car makes a horrible noise and no reply back at all!!!!