-28 16670
-28 16662
Now, adding 8 before the number (not the area code) should be enough. It's usually difficult to get through. Try a few more times!
Take the original graduation certificate, degree certificate, ID card and report card, and go to the employment guidance center of the graduation school first. The school should have a letter of introduction or something. You have to go to the provincial guidance center with the certificate and the materials given by the school, mainly at the school, and the school knows the details.