Airindia — paid for two tickets and have received only one.

Address:

Mumbai City, Maharashtra

Pnr no. : ai hs5qb for travel mumbai-frankfurt on 17.05.2019 n return frankfurt-mumbai on 16.06.2019 by air india
Inspite of repeated phone calls to[protected] the situation remains same. They promise each time n nothing is done.
How will we travel if we don't get the second ticket?
Absolutely disgusting and we are senior citizens. We are at a complete loss as to how to handle this airline because they just don't attend to or respond to our calls effectively.