Default [Q] Please help me with my new watch Z8!!!

Hi,
I am from ISRAEL and I bought the watch Z8 and it is work good but:
1. I can not make a call and receive a call and I tried several SIM cards maybe someone can help me?
2. There is something strange with Rechargeable battery is 100% and it will stay that way two or three days and after that it goes down to 90% or so and then the watch turns off?

Please help me...
Thanks,
Arie.