Vistara Airlines — Baggage damaged

Address:

New Delhi, Delhi, 110001

I have had the misfortune of travelling on vistara airline from ahmedabad to delhi on 18.06.2017 on flight no. Uk-966.
My booked baggage liberty make has been severely mishandled to the extent that it's handle (Which was of very good quality and flexibility) had been broken.
When the same was brought to the notice of vistara airline staff at ig airport delhi they tried to avoid the liability on various pretexts. They also banked upon the signatures of one of my co-passanger which were taken on the pretext of baggage not containing any power bank or other prohibited articles. However on persistence the staff realized that airline was at a fault and pir was prepared. The vistara staff at airport was totally inapt in their work and lacked professional commitment. They kept on passing the buck and wasted my precious time.
However the woes did not end there. On 19.06.2017 one person stating his name to be gopal visited my house and asked to takeaway the bag for repair. He did not carry any authorisation from vistara and also did not have any identity proof. He also did not carry any receipt-book to issue an official acknowledgement for taking away the bag. Calling to vistara airline office did not solve the issue as the official concerned did not have any knowledge about the procedure. They repeatedly asked me to handover the bag to the said person without seeking any receipt or official acknowledgement for handing over the bag.in the meantime the said person left.
The vistara airline staff has mishandled the bag causing it damage which is absolutely not possible in normal course of handling. The damage to my bag is such that repair is not an option and only way out is replacement.
Further they have caused me undue and uncalled for inconvenience due to inefficient handling of the matter at the airport and subsequently.
I send a complaint on 19.06.2017 which was acknowledged and on their request for further information a copy of the pir was sent to them.
Till date there has been no redress.
Going by the mess up created by vistara airline it appears that it is a call for going to a court of law and seek damages for the loss as well as for the harassment, inconvenience and other issues including an apology.
I am really perturbed.