St Courier — Lost product or stolen during logistics process

Address:

Sankarapuram ST courier

My fiancee she's working in episource Chennai. For diwali 2021 her company sent gifts(smart watch) through ST courier but during the process they lost or somebody stolen the parcel. They called her through mobile from sankarapuram ST courier office and they said that they received her parcel on 22nd Nov. They said that they will sent her parcel to nearest ST Courier office which is in pagandai x road. But when i asked to them they said that they haven't received any parcel from sankarapuram. Again we called to sankarapuram office to enquire about courier. But they don't have any reasonable excuses and they said will check on their side and do we have any shipper code for parcel which don't have. Still after many days there's no response from them.