It is not normal to have passed exams in June 2018...

It is not normal to have passed exams in June 2018 and not to have a return on his diploma at the end of January 2019.
It's been almost 3 weeks that I try to call in vain the school but nobody is reachable.
Please inform all the 2017-2018 promotion in the 3rd year of the results of their diplomas !!