Bharathiar University — phd viva

I am d. Thanga rajathi, doing phd (Mathematics) under part time - category b in bharathiar university.
I have submitted my thesis on 22 nd december 2018.
Now the two evaluation process was over. Last week 25 th september 2019 (Wednesday), i came to get signature from head of the department of maths in the communication letter to fix viva date.
Regarding this my guide dr. J. John met research director on friday (27/9/19).
Still they are not giving permission to conduct my viva. For that i am waiting from august 2019. No landline phone is working. I don't know how to contact.

I am very much depressed. Can anyone help me regarding this. My contact no is [protected].