It is impossible to contact Chinese Embassy in Tehran

I am as a full professor of Tehran University and Editor in Chief of an ISI international journal.
I have been cordially invited by the Harbin Normal University and Beijing Normal University in China.
In order to deliver my documents to the Consular for applying visa, I can not succeed to contact through the contact number which is provided by the Embassy (09353055520).

Now, I would be pleased if you could call me through my contact Nos.:
Mobile: 0912 115 8827
Office: 4486 5666

Best regards.
Professor J. Nouri