Probably the phone, not the car. When you pair, there is a permission box you have to use in order to export to the car. I had the same problem and that is what fixed it for me.
Did the dealer try with your phone? That is the one it needs to work with, not theirs. Go back to the dealer with your phone and have them explain it to you.I had tried that and still not working.
I even went to Mazda dealer to consult it. They tried with different Samsung phone and working.
I'm still confused.