Indira Gandhi National Open University — mark sheet not sent

Address:

Maidan Garhi, New Delhi, Delhi, 110068

I have completed M.Com (Finance and Taxation) from IGNOU on Feb 9, 2018. My enrolment number is[protected]. I have not received mark sheet and provisional certificate.
- They never pick phone. I called hundreds of times. Rarely if someone picks they will ask to call so and so number
- Mailed at [protected]@ignou.ac.in but no response was received
- Visited Regional center but they refuse to have any information regarding this

I don't live in NCR, it is very difficult for me to take leave and visit Maidan Garhi, delhi.
Please help me out.