Spice Jet Airlines — item retained and now lost by the airline (power backup)

Address:

Dehradun, Uttarakhand, 248001

I flew to dehradun on 06.08.2017 flight no. Sh124 where the airline took my power backup (Golden color) at delhi airport saying that it is not allowed in the plane. They said it will be returned on presenting my boarding ticket later on. So i sent someone to get it the very next day but they did not return the item saying that the person himself has to be present. And since i had just travelled to dehradun i could not go right away. So now that i am in delhi, today ie[protected] i went to the airport to collect my power back up but to my dissapointment the staffs are claiming to have lost the item and that its not available and they are not liable. I have my boarding ticket as a proof. I am very dissapointed at this. I believe its is the airlines responsibility to see to it that the items retained while boarding should be looked after and returned to the respective person. Its shameful for such big airline to be this careless and losing the property of a customer. Its already been a inconvenience for me travelling here and there for my power bank and above that your staff claim to have lost it. My power bank has been purchased from abroad. And i expect the airline to be descent enough to return the item to me or take actions regarding it. I have attached the picture of the boarding pass and other necessary doc which you may require to refer.