activation error ipad air (wifi only)

Dear community maybe someone have any idea. i try everithing but no luck. no body can answer what is the problem... I restore my ipad and after that I choose language and country but then with wifi or itunes can't be activated. 24 ours later works without any problems...

hope someone can help me , apple support was terrifying no answers at all... I live in Argentina and they told me "came to USA to verify it..."

thanks again.

regards,

Juan