Google Nexus 6 — Nexus 6p No Sounds, Slow Call functions, No orientation Censor.

Thanks in advance if somebody can help me.
I have used nexus 6p very clean set nothing damaged. I have tried every factory Image that google have because someone says it is because of software update.
I have went to Huawei service center. This device needs hardware optimization for Pakistan Region because It is Australian model and we dont have tools and software to do that for this model. And this is sort of region lock. Phone LTE and Apps working fine and this is bootloader unlocked! but no voice on speaker/handfree calling function is very slow and i can only listen songs on Bluetooth but no calls.
I am in big trouble please help
Asif