Delhivery — Missing items on delivery

I booked my package with awb number[protected] with 4 items which was shipped from delhi to imphal on 26/06/2020 and delivered on 17/07/2020. And i was delivered with only 2 package in it. I tried to complain for the same and they said will resolve the matter, and now they don't reply my mails and also said they won't take any responsibility.

And recently again with awb[protected], a total of 27kg (2boxes), only 1 box is delivered and the other missing.

I am assuming there is some sort of lagging in their services afterall i presume the courier although they offer good service, a theft of customer goods is present