syncing contacts on no 7 inch display infotainment

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mazda 2 evolve
Hi, i'm new on this forum.
I'm becoming mad trying to sync the addressbook of my phone (Sony Xperia Z5, that here Mazda says it's fully compatible)
with the - let me say - no 7'' display version of the "infotainment" on a brand new mazda 2 evolve.
The infotainment it's never syncing the contacts, so when somebody calls, i can see only the number in the tiny display.
I litterally tried everything.. resetting the infotainment, resetting the Z5 (factory reset, importing the google contact addressbook again...) but nothing.
It's impossible to sync and here in italy, mazda it's, like, not able to answer on how to solve it.

Also i'm having trouble whit random disconnections while a call is going.
I'm sure the Z5 has no problem on its side, cause i can have calls with other bt earphones, listen to music through it without any disconnection either.

Can anybody tell me how to set up this infotainment to sync the whole addressbook? I think it's impossible that i have to push them one by one from my mobile.

thank you in advance
 
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