Airtel — unable to connect to 000117 number from india

Address: Mumbai City, Maharashtra

Hello Team,
I am Airtel Prepaid customer on unlimited plan.
my number is [protected].
I am unable to connect to AT&T Toll-free conference number 000117 at all.
Kindly help.
Last connection attempt: 25 Jan 2019
Call Connected: Not possible

Complaint number registered with Airtel : [protected]

Thanks,

Alhad
Mobile : [protected]