Air India — luggage not received at the destination

Address:

Kanpur, Uttar Pradesh, 208001

My mother travelled from bengaluru to lucknow via delhi on august 8 2019 (Ai 501). For some reason, she had to re-checkin her luggage at delhi. The staff at delhi airport has not sent it over to lucknow, and this was confirmed by the manager as well at lucknow. She was told that the luggage would reach our address today, when another flight from delhi arrives today (August 9 2019). However, there has been no imitation on the same, neither are any air india numbers reachable. Please help.